4bt build.

[4btjeep]

ok so this is with the start of the project. 1997 grand cherokee with the 4.0 high output in it. (don't think it came like that) but its what i got.

plan 3:55 or 3:08 rears 4bt cummins 5spd manual trans and high 20's mpg

The start


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[WyoJeepin]

Sweet! Thats gonna be fun!

So why a 5spd? They have a really big rpm drop on the 3rd to 4th shift. I would use a 6spd or 47re from www.goerend.com

 

[4btjeep]

I am using a 5 spd because I have one around, and I have issues driving an automatic. I have a 6spd but i am saving that for a truck that will be pulling a trailer more. both my current trucks have a 5spd and i have no issues unless pulling. In the jeep, I won't be pulling, and it is a considerably lighter vehicle so i am using that.

 

[WyoJeepin]

Until I got this truck all my other vehicles have been manual. I have been driving big trucks for the last 8 years for a living, so I kinda like not having to row the gears. Several of the trucks I have driven had 2 transmissions, 15spd main and 4spd auxiliary.

 

[4btjeep]

I wanted to do a 2spd rear on my fummins.

 

[WyoJeepin]

Yaaaa, so much for that idea

 

[4btjeep]

well i got the parts, never did it dad killed it he is hell bent on fixin' it

 

[WyoJeepin]

Well, if he is gonna fix it then rock and roll!

 

[4btjeep]

he fixes it, he can keep it, i don't want a half assed repair i am constently fixing again, and its a bit of a tetanus bucket. the rust is beginning to accelerate its assault upon the truck. i give it stage 2 cancer as of the moment. Terminal if not surgically removed IMMEDIATELY! If not, it will be too far gone. 2 cab mounts rusted out already plus other

 

[WyoJeepin]

OOOOHHHH! Gotcha. Time to move on to something better!

 

[4btjeep]

Thats why dads got the fummins now. he killed it, he wants to fix it, and I had some fun with her. he can take on the Cancer issue there. I was going to learn more from it, find a rust free truck and do it again!

 

[4btjeep]

here is your update
and as far as I have gotten in the past couple months followed a change of plans and am using an allison auto i obtained at work today attached to another 4BT ($750) i aint going to complain about it. i have to find a tfer case for it and make driveshafts, but not the end of the world.

and here Trans and tfer case have been dropped since.
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[WyoJeepin]

cool, thanks for the update! Thats a good price for that combo. How many miles on it?

 

[4btjeep]

The combo had 10k miles on trans rebuild, and 160k on the motor. was in a grummen bread truck

 

[WyoJeepin]

Can't wait to see the proper color of smoke come outa that thing, what it should have been from the factory!

 

[4btjeep]

I will actually stick to not rolling coal with it. I have 2 diesels that do not roll coal at all, and still hold their own pulling. The jeep is all about economy, so coal=unburnt fuel= failure I shall not fail! lol I may tune it to roll some for a few pictures and such, but for the most part want to keep it kinda low power as boxing the frame is not in the plans as of the moment. I may become in the plans if it flexes too much.

 

[WyoJeepin]

While I understand your point, it will still make a puff when you turn the key.

 

[4btjeep]

my current 2 only do, when its cold. though the 97, will roll some soon, kinda hard to prevent with some of the upgrades for it