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Front diff question       #: 1953
 Moderated by: NoPower, Mike69, MaDMaXX,
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 Posted: Sun Feb 9th, 2020 04:37 pm
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4.0power
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 My boss had a 2008 Lincoln Navigator on the lift today, changing some fluids. He had the front diff cover off and I noticed it has a limited slip diff in it! Would any one know what size it is? Would it fit in a 1999+ ranger? I'd love to swap at the least diff assembly in my 2002.



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 Posted: Sun Feb 9th, 2020 05:51 pm
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Eddie Money
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 The front diff on our rangers is a dana 35 that is unique for ford I believe. Not sure what the navigator uses.



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 Posted: Sun Feb 9th, 2020 07:08 pm
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 Navigator uses same diff as expedition and f150 they are bigger then a ranger



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 Posted: Sun Feb 9th, 2020 07:30 pm
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 black06xlt wrote:
Navigator uses same diff as expedition and f150 they are bigger then a ranger
Damn it lol. Really want a limited slip for mine.



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2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Mon Feb 10th, 2020 03:52 pm
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 Eaton makes a tru trak for dana 35 in 27 spline just sayin-



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 Posted: Mon Feb 10th, 2020 03:57 pm
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 JAMMAN wrote:
Eaton makes a tru trak for dana 35 in 27 spline just sayin-
I wonder how the truck would feel being driven on the street with a limited slip up front.



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2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Mon Feb 10th, 2020 03:59 pm
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JAMMAN

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 AND torsen makes one also:

P/N 975420-0207B

https://torsen.com/availability-torsen-differential-ranger-dana-35/



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 Posted: Mon Feb 10th, 2020 04:02 pm
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 JAMMAN wrote:
AND torsen makes one also:

P/N 975420-0207B

https://torsen.com/availability-torsen-differential-ranger-dana-35/
Check your DM



____________________
2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Mon Feb 10th, 2020 06:08 pm
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Arthur
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 JAMMAN wrote:
AND torsen makes one also:

P/N 975420-0207B

https://torsen.com/availability-torsen-differential-ranger-dana-35/
WAIT WHAT? It's back in stock??
I've been mailing with Torsen and they told me it would be back in stock around "end of summer 2019" and would contact me.
Nothing since and I've been checking the website regularly. Even a few days ago it was still out of stock.



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 Posted: Mon Feb 10th, 2020 06:51 pm
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 I'm waiting for "OX" to fit up an Ox Locker for the D35 !
Will the front end from an F150 fit in a Ranger ?   That would be a good swap kit !



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Ltr,
2003 EDGE, Std Cab, Steppie, E4 Red, 5sp, 4x
5" SuperLift, 33" x 12.50 x 15"
Hurst Shifter
Mod'd Backrack to fit Steppie
Front and Rear Bumpers by Custom 4x4 Fabrication, OK; now Mike's Welding and Fabrication.
Working on more Mods, just need more time, longer days would work !
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 Posted: Mon Feb 10th, 2020 08:17 pm
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Arthur
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 JAMMAN wrote:
Eaton makes a tru trak for dana 35 in 27 spline just sayin-
And there's this supposedly:

https://www.powertrax.com/traction-systems-product/369907-limited-slip-differential-gt443527/?crt_viaSearch=groupcode%3AGPRO



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 Posted: Mon Feb 10th, 2020 09:07 pm
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 I would rather have a switchable type locker for the front, instead of having both front tires powered on wet roads.



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Ltr,
2003 EDGE, Std Cab, Steppie, E4 Red, 5sp, 4x
5" SuperLift, 33" x 12.50 x 15"
Hurst Shifter
Mod'd Backrack to fit Steppie
Front and Rear Bumpers by Custom 4x4 Fabrication, OK; now Mike's Welding and Fabrication.
Working on more Mods, just need more time, longer days would work !
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 Posted: Mon Feb 10th, 2020 09:50 pm
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Eddie Money
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 JAMMAN wrote:
AND torsen makes one also:

P/N 975420-0207B

https://torsen.com/availability-torsen-differential-ranger-dana-35/
Does this one have the helical gears just like the torsen rear diff we've been discussing in another thread?



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 Posted: Tue Feb 11th, 2020 01:18 pm
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Arthur
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 Scrambler82 wrote:
I would rather have a switchable type locker for the front, instead of having both front tires powered on wet roads.
It's totally transparent in 2wd
In 4wd in snow is where I could see problems but hearing from people who have one up front it's no problem. Slightly heavier steering.
When I get one in front I'll be able to tell for real



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2008 XLT 4x4 4.0 5Spd. Pretty much stock except 33's and Bilsteins: A bit broken for now.
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 Posted: Tue Feb 11th, 2020 06:53 pm
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 Eddie Money wrote:
JAMMAN wrote:

AND torsen makes one also:

P/N 975420-0207B

https://torsen.com/availability-torsen-differential-ranger-dana-35/
Does this one have the helical gears just like the torsen rear diff we've been discussing in another thread?
Yes it does. I don't know the bias ratio but it is going to be better than what you have in there.
Honestly I would expect no difference in steering or non 4WD handling. It isn't like a "locker".



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 Posted: Tue Feb 11th, 2020 08:16 pm
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 4.0power wrote:
JAMMAN wrote:

Eaton makes a tru trak for dana 35 in 27 spline just sayin-
I wonder how the truck would feel being driven on the street with a limited slip up front.
I had a 78 F100 that had a spool up front. Both tires turning at the same speed when the hubs were locked and I was in 4WD. It pushes until one of the tires slipped. It does take some getting used to and is a hoss in soupy mud or sand. A limited slip would be more manageable as it would lock up when it sensed the tires were not turning at the same speed as there would be some give.  You don't want to drive in 4WD with a LS front end on the street or even an icy road. Mud pits or sand hills only.



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 Posted: Wed Feb 12th, 2020 06:44 pm
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 With a decent Limited Slip Diff, and if it loses traction in both tires, both tires spin, and in turn loss of control, if it is the front end... no steering !
If a 4x has a good Limited Slip or Locker in the rear and a standard Open Diff in the front, it should be able to go in a lot of places with out any trouble and without the fear of loss of steering.
It used to be that new car manufacturers wouldn't add a traction device in the front diff, open diff only !
If the vehicle is only for Off-Road Use... Lock away but keep the front end steering pointed in the direction you want to go because once you slip it in 4x that front end is going where IT wants to.  Yes there are steering control devices, BUT that is more money.
Enjoy !

Ltr

Last edited on Wed Feb 12th, 2020 06:49 pm by Scrambler82



____________________
Ltr,
2003 EDGE, Std Cab, Steppie, E4 Red, 5sp, 4x
5" SuperLift, 33" x 12.50 x 15"
Hurst Shifter
Mod'd Backrack to fit Steppie
Front and Rear Bumpers by Custom 4x4 Fabrication, OK; now Mike's Welding and Fabrication.
Working on more Mods, just need more time, longer days would work !
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 Posted: Wed Feb 12th, 2020 08:57 pm
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4.0power
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 Scrambler82 wrote:
With a decent Limited Slip Diff, and if it loses traction in both tires, both tires spin, and in turn loss of control, if it is the front end... no steering !
If a 4x has a good Limited Slip or Locker in the rear and a standard Open Diff in the front, it should be able to go in a lot of places with out any trouble and without the fear of loss of steering.
It used to be that new car manufacturers wouldn't add a traction device in the front diff, open diff only !
If the vehicle is only for Off-Road Use... Lock away but keep the front end steering pointed in the direction you want to go because once you slip it in 4x that front end is going where IT wants to.  Yes there are steering control devices, BUT that is more money.
Enjoy !

Ltr
thank you for making my mind up! Lol. I got a 28 spline LSD for the rear diff just wanted to have some other people's input to what could be had and what affect it would have on the street.



____________________
2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Mon Feb 17th, 2020 01:53 pm
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Arthur
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 Scrambler82 wrote:
With a decent Limited Slip Diff, and if it loses traction in both tires, both tires spin, and in turn loss of control, if it is the front end... no steering !
If a 4x has a good Limited Slip or Locker in the rear and a standard Open Diff in the front, it should be able to go in a lot of places with out any trouble and without the fear of loss of steering.
It used to be that new car manufacturers wouldn't add a traction device in the front diff, open diff only !
If the vehicle is only for Off-Road Use... Lock away but keep the front end steering pointed in the direction you want to go because once you slip it in 4x that front end is going where IT wants to.  Yes there are steering control devices, BUT that is more money.
Enjoy !

Ltr
The difference is that it's not actually a locker.
It doesn't work like a regular clutch limited slip slip either.
It's torque biasing so when there is slip it doesn't try to turn the wheel at same speeds but transfers torque to the wheel whith most traction.

Quote from the web:

"If your vechicle is stuck it is because you are generating no torque(Physics defines torque as force required to overcome resistance). If you are stuck spinning wheels you are generating no torque(force to overcome the resistance being applied to the truck). The bog hole you are in whatever you are generating no tractive effort.

Torque is generated at the tyre surface not the crown wheel, if a tyre is in the air on an open diff what happens you move no where cause all the engine power goes to that wheel and it free spins as a diff follows path of least resistance. If torque was generated at the crown wheel you would still move forward as the other tyre would have to turn.

So looking at a torsen with a bias ratio. If one tyre is getting some grip eg: largely spinning but still generating some torque if it has a bias ratio of 4:1 it will try and bias 4 times the torque generating at the some what slipping gripping wheel to the other tyre. Now this tyre starts to turn this may actually in off road cases be too much torque for this tyre to handle and may cause more slipping gripping wheel spin and it than becomes the weakest link and the diff will not bias 4 times that torque to the other tyre(This will continue to happen quickly and smoothly). This sensation is what can generate understeer in hard turn situation with low traction and make a torsens feel like it's a locked diff.

This is why torsen doesn't work with a wheel in the air or dropped completely into mud, If the low traction tyre is just spinning generating no torque with a 4:1 ratio 4x0=0... even 7:1 7x0=0. Torsen relies on the low traction tyre to have some tractive effort."

If it would behave so badly why  did they developed that Ranger front torsen for race trucks. Also subaru sti's come with front and rear torsen and they're designed to go down snow covered roads... FAST.

So there's some drawbacks, like at full lock under power, but MUCH more manageable than a locker.

Edit: Also, both front tires spinning (as in slipping, not just rotating they have to rotate  to go anywhere lol ) does not automatically mean no steering. BOTH wheels turning at exacty the SAME rpm would cause loss of steering. But that's not what the Torsen does.
(Still talking on loose/slippery surface)

Last edited on Mon Feb 17th, 2020 02:04 pm by Arthur



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