The Stovebolt Site Forums The Shop Area Engine Shop 250 c.i. with T-4 Borg Warner

I currently have a 3 speed on the tree with a 250 c.i. and the 3 speed is getting worn out (leaking, speedometer gear, grinding, and 3rd is not high enough). I was wondering if a T-4 Borg warner will bolt up to my 250, because I found one for a very good price.

I think the t-4 has the ford bolt pattern. Like a t-5 out of a mustang. I'm pretty sure you could use a jeep 2.5 to t-4 bellhousing or an aftermarket adapter to bolt it up, but then your "very good price" is sorta moot! Unless you can find the jeep bell on the 'bay or something.

Well maybe, but this one was out of a S-10 so i was thinking it would be the same, but thanks for the input.

And, the seller said he previously had it in his 235 inline, so i guess what my question is, will a tranny that will bolt up to 235 bolt up to a 250?

Yes it should bolt right up to your bell housing. Should have a 1 inch 14 spline shaft so you will have to change your clutch disc. Should be the same transmission as a T-5 with out the overdrive gear. You can add the right parts a make a t-5 out of it. I used a T-4 main case to replace a bad one on my T-5 and it all looked the same. Some of the jeep parts web sights offer a converson kit. So just go by the tech tips for installing a T-5.

T4 is a 4-speed version of the T5. same problems apply. -need to cut the input bearing retainer, extend the splines and cut off the pilot portion, or pull the input shaft and bearing retainer from a camaro V6

Thank yall, I think i am going to take on this project,it should be interesting since this is my first real transmission work and I am only 17.

Did GM use a t-4? The only ones I have seen are from jeeps and I think I saw a fomoco version. I have never heard of a gm pattern t-4. What did they come in originally?

sorry, just looked at drivetrain.com and saw they were used in 83-84 camaros and 83-87 s-10's. You learn something everyday. I pulled a saginaw out of an '82 camaro and assumed they went straight to the t-5.

I'm not sure this will solve all your problems. You stated that your 3 speed is not high enough. Unless this trans is an overdrive it will not change your final ratio which will still be 1:1. Fred

I agree, I'm gonna run a t-5 in mine.

I realize that, but with a lower first gear I think I will be able to get a higher Rear End Gear.

I doubt that the T-4 has a much lower first gear than the original 3 speed or the T-5. I think you could do the T-5 conversion much cheaper than buying the T-4 and then having to replace the rear end gears. You could also look into the factory overdrive that was available for a 65.
Fred

oh well, I have already bought it. Maybe in the future, if I don't like the T-4 I can look for a T-5. But if nothing else this will be a lerning experience for me. Also, if I do the conversion correctly, I will know what to do and how to do it for next time.

And I have looked into the "Gear Vendors" which bolts on behind your existing transmission and adds a lo/hi to every gear, but that price is through the roof. I have not been able to find the factory overdrive. Thank yall for all the input and advice.

The T4 just lacks the overdrive. You would need to swap out the tailshaft and add the 5th gear. That is the beauty of the T4 / T5 family. kind of like mr potato head