4x4 transmission for a 4FB1

This is the place to discuss DIESEL engine modifications.
damarble
Regular Member
Posts: 8
Joined: Wed Jul 27, 2016 7:40 pm
Location: Spokane
Isuzu vehicle(s): I-Mark

4x4 transmission for a 4FB1

Postby damarble » Wed Jul 27, 2016 8:14 pm

I've been reading trying to make sense of this and have found conflicting information. I have a 4FB1 going into a custom chassis and need it to be 4x4. I do still I have the stock I-Mark 5 speed if it matters.

From what I gather 2.3 gas transmissions fit. I have located a transmission from an 89 Trooper 2.6 that I would like to use if it fits. I've seen some people say no on 2.6 trans and some say yes.

Any help? Thanks.

damarble
Regular Member
Posts: 8
Joined: Wed Jul 27, 2016 7:40 pm
Location: Spokane
Isuzu vehicle(s): I-Mark

Re: 4x4 transmission for a 4FB1

Postby damarble » Thu Jul 28, 2016 1:06 pm

The 2.6 trans sure looks like it will bolt up. Going to get it this weekend.

User avatar
JoeIsuzu
Site Admin
Posts: 19958
Joined: Thu Aug 19, 2004 9:11 am
Location: Germantown (next to Elvistown), TN
Isuzu vehicle(s): Original owner, '83 LS Diesel, 5-spd, 2wd, Long Bed, restoration in progress!

Re: 4x4 transmission for a 4FB1

Postby JoeIsuzu » Thu Jul 28, 2016 2:23 pm

Bolt patten is supposed to be the same. I'm not sure which flywheel you'd need. I think the gearing is pretty different from the MSG 4x4 5-speeds that were used in '86-'87 P'ups, but I don't recall exactly how. This is supposed to be a stronger transmission than the MSG.

I'll bet oldestisuzuist could tell you all the details. ;)

Jack

User avatar
puttputtinpup
Regular Member
Posts: 10175
Joined: Sat Oct 08, 2005 5:18 am
Location: Winston Salem, NC

Re: 4x4 transmission for a 4FB1

Postby puttputtinpup » Thu Jul 28, 2016 3:03 pm

Hydraylic clutch vs cable is a difference between the 2

User avatar
JoeIsuzu
Site Admin
Posts: 19958
Joined: Thu Aug 19, 2004 9:11 am
Location: Germantown (next to Elvistown), TN
Isuzu vehicle(s): Original owner, '83 LS Diesel, 5-spd, 2wd, Long Bed, restoration in progress!

Re: 4x4 transmission for a 4FB1

Postby JoeIsuzu » Thu Jul 28, 2016 3:20 pm

puttputtinpup wrote:Hydraylic clutch vs cable is a difference between the 2

Great catch, I'd forgotten that.

So if you're getting the MUA-5, it would be best to grab the whole clutch pedal, bracket, master cylinder, line, and slave cylinder if the price isn't prohibitive and if you don't already have those parts.

Jack

damarble
Regular Member
Posts: 8
Joined: Wed Jul 27, 2016 7:40 pm
Location: Spokane
Isuzu vehicle(s): I-Mark

Re: 4x4 transmission for a 4FB1

Postby damarble » Thu Jul 28, 2016 5:41 pm

He's letting me have the whole clutch system, drive shafts, and trans for $140, seems reasonable enough.

User avatar
JoeIsuzu
Site Admin
Posts: 19958
Joined: Thu Aug 19, 2004 9:11 am
Location: Germantown (next to Elvistown), TN
Isuzu vehicle(s): Original owner, '83 LS Diesel, 5-spd, 2wd, Long Bed, restoration in progress!

Re: 4x4 transmission for a 4FB1

Postby JoeIsuzu » Thu Jul 28, 2016 7:51 pm

damarble wrote:He's letting me have the whole clutch system, drive shafts, and trans for $140, seems reasonable enough.

Sounds like a really good deal. I'd recommend taking a look at the lube in the transmission. If it looks like 90w gear lube, I'd pass on it. Isuzu manual transmissions require motor oil of the same viscosity as the engine. Using 90w gear lube will contribute to premature failure.

Jack

damarble
Regular Member
Posts: 8
Joined: Wed Jul 27, 2016 7:40 pm
Location: Spokane
Isuzu vehicle(s): I-Mark

Re: 4x4 transmission for a 4FB1

Postby damarble » Thu Jul 28, 2016 11:17 pm

Thanks guys.

On a tangent, has anyone on here stacked transfer cases? I see it takes some modification to the tailshaft but can be done by adding a t-case from behind an auto. I might not have the wheelbase for it though and may have to go with a 3:1 kit.

damarble
Regular Member
Posts: 8
Joined: Wed Jul 27, 2016 7:40 pm
Location: Spokane
Isuzu vehicle(s): I-Mark

Re: 4x4 transmission for a 4FB1

Postby damarble » Mon Mar 12, 2018 2:26 pm

This project never took off but I'm back at it now after talking with DieselJeep on Facebook. I have a 52 M38A1 I'm going to give it a go in.

From what I can gather it's not difficult to mate a SM465 to a Jeep T5 bellhousing and if a Jeep T5 mates to an Amigo bellhousing I would deduce that a SM465 can also mate to an Amigo bellhousing.

4x4 T5s are very hard to come by for me so this is why I am looking at this alternative.

damarble
Regular Member
Posts: 8
Joined: Wed Jul 27, 2016 7:40 pm
Location: Spokane
Isuzu vehicle(s): I-Mark

Re: 4x4 transmission for a 4FB1

Postby damarble » Wed Mar 21, 2018 10:13 am

I bough a 2.6 T5 bellhousing so let's see how this goes.


Return to “Diesel - Performance Mods & Upgrades”

Who is online

Users browsing this forum: Google [Bot] and 6 guests