[RESOLVED] Transfer Case (Fitament), Will it work?

[Jimmer307]

Ok so im about to buy a Transfer case from a 95 Eclipse GSX Manual. I was wondering if a 95 Manual GSX Transfer Case is compatible with a 98 Eclipse GSX Manual????

Is Driveshaft the same?

Is the Rear Differential the same?

Are all of the axels the same?

 

[jrohner]

The gear ratio in the 97-99 transfer cases are different because they use a different front differential gear ratio and use the transfer case to match the rear diff up to it (rear diff's are the same). The 95-96 t-case is identical to the older ones.

 

[wancsta]

+1 sucks I know

 

[Jimmer307]

The gear ratio in the 97-99 transfer cases are different because they use a different front differential gear ratio and use the transfer case to match the rear diff up to it (rear diff's are the same). The 95-96 t-case is identical to the older ones.

SOOOOO... Next question...
If i have a 95 Talon TSI AWD Tranny put in my car can i use the 95-96 transfer case?
If the tranny is put in my car will the my 98 GSX transfer case not work?

Thanks for all the info thus far

 

[rush2252]

SOOOOO... Next question...
If i have a 95 Talon TSI AWD Tranny put in my car can i use the 95-96 transfer case?
If the tranny is put in my car will the my 98 GSX transfer case not work?

Thanks for all the info thus far

Check the spline count. There are 21, 22 & 23 spline count transfer cases

-Kolby

 

[fastfive0]

All 2g transfer cases have the same spline count....the difference is in the gearing as noted above.

 

[Jimmer307]

All 2g transfer cases have the same spline count....the difference is in the gearing as noted above.

Where is the gearing different? In the transfer case or in the tranny.

 

[twicks69]

Where is the gearing different? In the transfer case or in the tranny.

Both the transmission and the transfer case have different gearing for 1995-1996 vs. 1997-1999.

The 1991-1996 transfer case have the same ratios (1.090 ratio). As well, the 1990-1996 transmissions have the same front differential 58-tooth ring gear.

The 1997-1999 transfer case is a different ratio (1.074 ratio) from the earlier ones because the transmission uses a 57-tooth front differential ring gear.

If you have a 1998 GSX manual transmission vehicle, you will need a 1997-1999 transfer case, or you will need a professional transmission rebuilder to swap out your 57-tooth front differential ring gear for the 58-tooth ring gear from the 1990-1996 transmissions to utilize a 1991-1996 transfer case. The output shaft pinion gear is the same for all 1991-1999 5-speed AWD transmissions.

The rear differentials are the same on 1995-1999 vehicles (3.545 ratio).

If you use a 1991-1996 transfer case with a 1997-1999 transmission without swapping the front differential ring gear, you will end up with a transmission that is powering the front wheels 2mph different than the rear wheels, which will destroy your center differential, rear differential, and your viscous coupler. Either swap the front diff ring gear and pick up a 1991-1996 transfer case, or get the proper 1997-1999 transfer case for your application.

The driveshaft is the same for all 2G DSM's 1995-1999.

The front axles are different depending on the application of ABS vs. Non-ABS as they would or would not have an ABS ring pressed onto the outer CV hub. As well, the driver-side half-shaft (the shaft that is installed into the transmission, and is bolted onto the engine block, NOT THE AXLE) is different between the 1995-1996 models vs. the 1997-1999 models because of the flange bolt placement. You cannot interchange a 1995-1996 halfshaft with a 1997-1999 halfshaft and have it bolt up properly. The axles are the same in size and splines, and fitment other than the ABS ring stuff.


Finally, the transfer case output shaft spline count is either 22-spline for 1989 through mid-1990 transmissions, or 23-spline for late-1990 through 1999 transmissions. There are no 21-spline tranfer case output shafts in USDM 1989-1999 transmissions.

 

[fastfive0]

twicks your last post should be a sticky!!! That was alot of VERY good info!

 

[antilag]

SOOOOO... Next question...
If i have a 95 Talon TSI AWD Tranny put in my car can i use the 95-96 transfer case?
If the tranny is put in my car will the my 98 GSX transfer case not work?

Thanks for all the info thus far

If you put a 95 tranny in your car you have to use a 91-96 transfer case as pointed out by twicks.

So yes your 98 transfer case will not work with the 95 tranny and the 98 tranny will not work with the 95 transfer case

 

[AWD_Hybrid]

twicks69 the 1.074 would be more suited in a 1991-1996 with a
welded centre diff tho. It would make the rear revs a closer match.
Welded c/diff in a 1991-1996 with 1.090 makes rears -66½" - 1/4mile
eg: Car up on the hoist with lsds both ends, mark 6 o'clock on the
front & rear tyre, turn the front wheel 10x & look at the rear tyre,
it will be 3 1/8" short of reaching 6 o'clock. 1 turn = 5/16"
I run 5/16" more rear tyre circumference to compensate for ^^
F 215/45/17 - R 245/40/17.
Cheers !

 

[twicks69]

twicks69 the 1.074 would be more suited in a 1991-1996 with a
welded centre diff tho. It would make the rear revs a closer match.
Welded c/diff in a 1991-1996 with 1.090 makes rears -66½" - 1/4mile
eg: Car up on the hoist with lsds both ends, mark 6 o'clock on the
front & rear tyre, turn the front wheel 10x & look at the rear tyre,
it will be 3 1/8" short of reaching 6 o'clock. 1 turn = 5/16"
I run 5/16" more rear tyre circumference to compensate for ^^
F 215/45/17 - R 245/40/17.
Cheers !

Aldo, thanks for the information! That is one way of running staggered sizes on an AWD car with a locked center differential.

 

[AWD_Hybrid]

twicks69 I typed this up to clear up why gearing is out.
Why I use odd dia tyres to compensate for my locked centre diff.
A 1G AWD Auto has a 3.6 front diff (72/20)
My transfer case has 1.090909090909090909090909090909 (24/22)
So my transfer case drive ratio to the rear is 3.3
My rear diff is 3.307692307692307692307692307692 (43/13)
So my rear underdrives by .007692307692307692307692307692
I may be wrong in saying this, but I think the reasoning for
underdriving the rear on a car that turns corners quite offten,
is to cancell out understeering through corners in conditions.
When turning, your front tyres are scrubing & traveling less
disstance than your rear tyres that are basicaly going straight.
So by underdriving the rears, they match closer while turning.
I have vslsds both ends & I put it up on a hoist to test her.
I marked 6 o'clock with a marker on a front & rear tyre.
Turned the front wheel 10x slowly to avoid slipping.
Checked the rear tyre to find it 80mm before 6 o'clock.
So the rears in 1 revolution, is 8mm - 5/16" underdriven.
*My compensation is 215x45x17 fronts & 245x40x17 rears.
My car rolls easily in neutral if I push it & doesn't bind.
Anyway, I thought I'd give you's some triva or bs for the day.
Cheers !

 

[twicks69]

I appreciate it! Thanks for the information!

 

[DSM98GSX]

Hey twicks69. Thanks for the info. Everything I needed to know you said. Just wanted to say thanks for your time and input on all this.

 

[twicks69]

Anytime! I am happy I could help!

 

[Scott McIntyre]

If you have a 1998 GSX manual transmission vehicle, you will need a 1997-1999 transfer case, or you will need a professional transmission rebuilder to swap out your 57-tooth front differential ring gear for the 58-tooth ring gear from the 1990-1996 transmissions to utilize a 1991-1996 transfer case. The output shaft pinion gear is the same for all 1991-1999 5-speed AWD transmissions.

I have a 97 on which I plan to install a 96 transmission.

Couldn't I simply swap the my 97 front diff into the 96 transmission, bolt it on the car, and mate it to my 97 transfer case?

Or swap the 96 gear stacks into my 97 case (w/97 front diff)?

 

[mindset]

twicks69 the 1.074 would be more suited in a 1991-1996 with a
welded centre diff tho. It would make the rear revs a closer match.
Welded c/diff in a 1991-1996 with 1.090 makes rears -66½" - 1/4mile
eg: Car up on the hoist with lsds both ends, mark 6 o'clock on the
front & rear tyre, turn the front wheel 10x & look at the rear tyre,
it will be 3 1/8" short of reaching 6 o'clock. 1 turn = 5/16"
I run 5/16" more rear tyre circumference to compensate for ^^
F 215/45/17 - R 245/40/17.
Cheers !

Is it important that we compensate like this?
If it makes a difference I'm looking into Shep's Stage 3 trans with the 4-Spider Diff.

 

[Littlebeeper]

i would assume that this difference in gearing of the Ring gear of the 95-96 vs the 97-99 transmission/transfer cases applies to the manual transmissions/transfer cases as well as the automatics?

 

[97eclipseNT]

does anyone know if there are any differences between any of the housings (at/mt/galant vr4)?

 

[AWD_Hybrid]

Is it important that we compensate like this?
If it makes a difference I'm looking into Shep's Stage 3 trans with the 4-Spider Diff.

The manual front diff ratio divided by the transfer gearing is not out as much as
in autos. Just run more air pres in the rear tyres if you lock the centre diff.
I'd like to get 25/23 gearing made for my auto transfer case.
It would give me 0.0014155712842558 overdrive at the rears.
97eclipseNT the centre section of man/autos have different bolt spacing.
I'm running an auto front & a switchable man centre & tail section.
The mid top mount I ground back to clear the auto box.
So I'm only running the front 3 bolts. It hangs in there ok tho.
The auto front is machined back 4.5mm to make my gears mesh.
I have lsd front & rear awd & switchable to run just lsd fwd.
Cheers !

 

[Justins2gawd]

thanks twicks you helped me out with that info too. I just did an engine swap as well as the transfercase i swapped into a 99 tranny and had my mechanic change the transmission to a 96 , not even knowing that is what needed to be done , come to find out that he never changed the transmission and only changed the clutch because i was doing both my tranny went out within 500 miles and i wondered why , it wasnt till i read this post that i went to investigate and grabbed the what i thought to be the 99 tranny and realized hey this is still the 96 so basically to cut a LONG story short you solved the problem with my car that would have been and on going issue and because my mechanic screwed up by not changing it it didnt take much with your info to prove he had screwed EVERYTHING up and so now hes paying for the parts = ) thank you sooo much that info was Great you deserve an award or something . Thanks

 

[Justins2gawd]

twicks69 I do have one more question though you listened all the stuff that it would damage , however does that mean that it also ruined the transfer case too or did it just ruin the transmission? I just wanna know if now i also need to change the transfer case. Thanks , Justin

 

[fastfive0]

as stated before this should be stickied in the drivetrain tech forum as this is great info!

 

[twicks69]

twicks69 I do have one more question though you listened all the stuff that it would damage , however does that mean that it also ruined the transfer case too or did it just ruin the transmission? I just wanna know if now i also need to change the transfer case. Thanks , Justin

Usually it would take out the center differential and/or the transfer case. I would still recommend opening up your rear diff case and inspecting the rear diff, along with doing same for your transfer case and transmission by letting a DSM transmission rebuild specialist take a look at them.

Good luck with your project!