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DRIVETRAIN BIBLE #620747 06/29/05 11:10 PM
Joined: Jan 2001
Posts: 13,649
fasteddy Offline OP
Web Wheeler
*****
I think most of the data is here, and maybe all we need is a list of links to archived stuff and sites, but I have specific questions, since I'm about to spend the bucks for the parts.

I'm doing the V6 lockup converter mod. Does the v6 tcase bolt and spline to the 4cyl tcase, and is there any advantage to the v6 case. I'm also going to do a v6 front diff swap in prep for (hopefully along with) a front lsd. I may also do a regear to 4.222, and if so, do the 4.222 p/u gears fit the monty v6 front lsd, AND the 2.6 leaf spring rear diff, or do I need a v6 (and monty or p/u?) rear axle with leaf perches (and maybe soa in the rear). Rear will have a sway bar if I can find room, with an Aussie disco. Also want to figure out rear discs, even if I have to have a manual rear brake pump and an isolation valve.

How 'bout driveshaft yoke spline sizes? All the same??

For the rest of the bible, we need a section on tcases, like which ones for sure have neutral detents, do a/t and m/t tcases have the same input? Word on pto's, too. I'd also like some word on Lloyd's deal on mods to later tcases to avoid major chain failure, if any body has the detail word.

Section on diffs, lsd's, lockers, etc.

Section on m/t's, and a/t's, too.


Not responsible for advice not taken...
Re: DRIVETRAIN BIBLE [Re: fasteddy] #620748 06/30/05 12:40 AM
Joined: Feb 2004
Posts: 10,238
FrankR Offline
Web Wheeler
****
Transfer Case Assembly for '89

2.6L M/T = MD729807
2.6L A/T = MD729808

3.0L M/T = MD733918
3.0L A/T = MD733924

The case appears to be the same for both M/Ts and for both A/Ts:

M/T = MD716569
A/T = MD721485

There are some cable brackets that are different and the speedometer cables are different.

There appear to be a few more minor differences in the Ram models - brackets, cables, nuts, pulse generator, cover gasket, speed sleeve, etc.

Output shafts are the same for all models.

Hope that helps.

Frank


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
Re: DRIVETRAIN BIBLE [Re: fasteddy] #620749 06/30/05 04:39 AM
Joined: Apr 2003
Posts: 1,393
ForcedAir_Montero Offline
Body Damage is Cool
I know the t-case gears are different between auto and manual, and I thought the V6 AUTO tranny had a different spline count. That's what would be required if/when we get further in the NP231 swap.
Driveshaft spline is the same, but V6s used a different flange at the rear pumpkin.
The front was stock V6 length after I swapped in a V6 A/T AND a V6 front diff.


-Dave D
Reservoir of Useless Knowledge

"But... If I kill all the golfers, they'll lock me up, and throw away the key..."
-Bill Murray

'84&change Monty MPI Turbo, choptop, f&r lsd, swapped in AT- All the goodies!
Re: DRIVETRAIN BIBLE [Re: ForcedAir_Montero] #620750 06/30/05 11:25 AM
Joined: Feb 2004
Posts: 10,238
FrankR Offline
Web Wheeler
****
Quote
I know the t-case gears are different between auto and manual, and I thought the V6 AUTO tranny had a different spline count.


Correct on the gears - I missed that one. The input gear is different between manual and auto:

M/T = MD731636
A/T = MD732599

As far as I can tell, the FSM parts list shows the same F/R ouput shafts for M/T and A/T.

Frank


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
Re: DRIVETRAIN BIBLE [Re: fasteddy] #620751 07/01/05 06:47 PM
Joined: Jan 2000
Posts: 7,309
PHIL_ Offline
Trail Leader
*****
Great idea. Why don't I sticky it, and when we have enough built up here, we'll turn it into an article for the tech section, that we can update as needed...

PHIL


1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/

Re: DRIVETRAIN BIBLE [Re: fasteddy] #620752 07/01/05 07:26 PM
Joined: May 2000
Posts: 6,132
K
Kevin C Offline
Trail Leader
****
Quote
I think most of the data is here, and maybe all we need is a list of links to archived stuff and sites, but I have specific questions, since I'm about to spend the bucks for the parts.

I'm doing the V6 lockup converter mod. Does the v6 tcase bolt and spline to the 4cyl tcase, and is there any advantage to the v6 case. I'm also going to do a v6 front diff swap in prep for (hopefully along with) a front lsd. I may also do a regear to 4.222, and if so, do the 4.222 p/u gears fit the monty v6 front lsd, AND the 2.6 leaf spring rear diff, or do I need a v6 (and monty or p/u?) rear axle with leaf perches (and maybe soa in the rear). Rear will have a sway bar if I can find room, with an Aussie disco. Also want to figure out rear discs, even if I have to have a manual rear brake pump and an isolation valve.

How 'bout driveshaft yoke spline sizes? All the same??

For the rest of the bible, we need a section on tcases, like which ones for sure have neutral detents, do a/t and m/t tcases have the same input? Word on pto's, too. I'd also like some word on Lloyd's deal on mods to later tcases to avoid major chain failure, if any body has the detail word.

Section on diffs, lsd's, lockers, etc.

Section on m/t's, and a/t's, too.


The 4 cyl auto transfer case bolts on to the V6 auto.

The transmission cases are the same between lockup and non lockup, 4 cyl and V6's (autos 87 to 91 ).

Bell housings, pumps and valve bodys are changed for lockup vs non lockup, V6 and 4 cyl.

I have found in my Raider the lockup converter is just fine with 4.66 gears and 33" tires. I dont reccomend taller gears.

The OD unit and torque converter clutch have lived with full throttle and lockup and did not seem to be bothered one bit.

I picked up and easy 2 MPG with the lockup converter that I lost with my taller tires. I got 20 MPG at 70-75 mph on 31's. That included a bit of LA stop and go.

Kevin


87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: DRIVETRAIN BIBLE [Re: Kevin C] #620753 07/04/05 09:10 PM
Joined: Sep 2001
Posts: 8,557
LandRaider Offline
Forum Moderator
*****
Only Manual Transfer cases got a neutral detent stock, but the auto transfer cases have a neutral spot... only no detent. You just have to make a detent in the shifter rod, and you have neutral on an auto case.


87 Raider 4D56td v5MT1
31's..Basically Stock
Re: DRIVETRAIN BIBLE Keep your front axles in! [Re: LandRaider] #620754 09/19/05 05:03 AM
Joined: May 2000
Posts: 6,132
K
Kevin C Offline
Trail Leader
****
PN's for axles into the front diff:

PN MB393911 is a 28 MM OD clip for the small diamter axle, 4 cyl.

MB393884 is a larger , thicker clip for the passenger side axle on V6 front diff 30.5 mm OD.

MB526189 is 29.7 OD clip for the V6 front axle , drivers side.



Kevin


87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: DRIVETRAIN BIBLE [Re: fasteddy] #620755 11/22/05 01:26 AM
Anonymous
Unregistered
Can u list all availble gear ratios for GenI Monty/Raiders? I have a friend that just picked one up w/a blown engine and will be swappin in a Ford a Chevy V6 and drivetrain. He may possibly re-use the rear axle. He's going 33's. Front axle will be coiled Dana 30HP (he has many!). Thanx.

Re: DRIVETRAIN BIBLE #620756 12/03/05 07:47 AM
Joined: Jan 2001
Posts: 13,649
fasteddy Offline OP
Web Wheeler
*****
3.909
4.222
4.625
4.875
5.29?


Not responsible for advice not taken...
Re: DRIVETRAIN BIBLE [Re: FrankR] #620757 01/19/06 05:02 PM
Anonymous
Unregistered
I know it may be of limited interest here, but can anyone add the same info (cases, splines, gearR) for 4D56 setups from the UK and JDM models?

Possible future pipe dreaming here.

thx

Re: DRIVETRAIN BIBLE [Re: fasteddy] #620758 03/17/06 09:36 PM
Anonymous
Unregistered
is the 4.875 ratio avalible in a 1990 montero, or just the 4.62's? Can the genI gears be put into the genII third member? <img src="/forums/images/graemlins/confused.gif" alt="" />

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