can i use a t5 or 700r4 behind my 250 straight six?

[maroon88iroc]

i have a 69 firebird that i am currently restoring, and i plan on keeping the straight six in it. with hopes of getting better gas mileage and because you just dont see people using them very often. my question is i want to change the transmission out. it is a chevy straight six in the car, i believe it is a 250 ci but i am not positive. i have both a 700r4 and a t5 sitting in my garage, if i could use either of them i would much rather that then whats in it. currently in the car is the factory 69 super turbine 300. how about that for a transmission! lol, it is a 2-speed, basically the same as a power glide. obviously i am wanting a couple more gears because i am planning on driving it to the turkey rod run in november. so i dont think that 2-speed is going to make the interstate driving very fun.

i am just looking for some insight, i know nothing about this motor i have never had anything other than a v8. i have plenty of parts laying around and transmissions, i would like to put something behind this motor that is going to work a little better for driving around town and hitting the interstate some. i would rather run the t5 but either is fine with me. just looking for help, hopefully someone else has done this before.

[6'9"Witha69]

Yes. 700 question already adressed here

https://www.pro-touring.com/forum/showthread.php?t=46183

[Kenova]

In the late '70s we swapped out sixes for SBCs without any problems.
That T5 would be a blast behind an inline six.

Ken

[Twentyover]

Cool deal on the six. Too bad it's a Chevy and not one of the OHC Pontiac six motors

[maroon88iroc]

In the late '70s we swapped out sixes for SBCs without any problems.
That T5 would be a blast behind an inline six.

Ken

ya thats what i am thinking! since i know the t5 will work i have to figure out how to use the hydraulic clutch assembly. i have done some research and it seems like there is alot of modification that needs to be done to make it work. i swaped from an auto to a t5 in my 88 iroc and it was a simple bolt in type deal. but i have to figure out pedals and a mount for the master cylinder. do you guys have any idea's on this?

so i am assuming this L6 uses a sbc 2-piece rear main seal? if it does that will be great because i already have that flywheel laying around :headbang:

i have pretty much a complete setup to put the 700r in. i have the converter, the tv cable, shifter and shifter cable. pretty much everything i need to put that in. i will have to make a bracket for the tv cable but after looking at the pictures in the other thread i dont think that will be very difficult. ill also have to come up with a trans mount and cut the driveshaft. on the other hand i would really like to have a 5-speed in it. i think that would be super cool behind the L6! but all i have is the trans and bellhousing. i gotta get a shift fork and boot, clutch kit, some kind of pedal assembly, all the hydro's i need, fab a trans mount, and cut the driveshaft.

[Randy67]

You can do the T5 with a mechanical linkage, like the 83 Camaro had. Lakewood makes a bellhousing for 82-83 F-bodies with either the ST10 4 speed or the T5 trans. Here is the bellhousing:
http://store.summitracing.com/partdetail.asp?autofilter=1&part=LAK%2D15015&N=700+4294925134+400272+4294822099+4294851526+4294 900927+115&autoview=sku

[TPI Monte SS]

You can do the T5 with a mechanical linkage, like the 83 Camaro had. Lakewood makes a bellhousing for 82-83 F-bodies with either the ST10 4 speed or the T5 trans.

That's what I did to use mechanical linkage with the WC T5 in my '88 Monte SS, except I'm using a factory '83 F-body bell. In your case, you can get the Lakewood bell, then use a factory F-body mechanical pedal setup (Z-bar, clutch pedal, pushrods). Then you'd just need to fab the crossmember and shorten the driveshaft. Good luck!

[maroon88iroc]

i dont want to spend that much money on a bellhousing. i already have the t5 bellhousing. i just have to get everything else. i think i am just going to make the hydro set up work.

tpi monte are you on tgo?

[TPI Monte SS]

i dont want to spend that much money on a bellhousing. i already have the t5 bellhousing. i just have to get everything else. i think i am just going to make the hydro set up work.


Sounds like a plan, budget-friendly all the way! As long as you can get the 3rd-gen hydraulic pedals to work in your 1st-gen you're good to go.


tpi monte are you on tgo?

Yep, but I haven't floated into that site in a looooooong time. How is it these days?

[maroon88iroc]

Sounds like a plan, budget-friendly all the way! As long as you can get the 3rd-gen hydraulic pedals to work in your 1st-gen you're good to go.



Yep, but I haven't floated into that site in a looooooong time. How is it these days?

i just thought i remembered seeing you on there. i dont get on too much anymore either. im kinda getting out of the thirdgens. i got tired of dumping money into my iroc that will never be worth anything lol. its my first car so id never sell it but still thats throwing money away. i mess with alot of different stuff now and spread my money out. as of lately i havent been making much money nobody wants to buy anything lately i am trying to sell my 67 and both my vettes..

on the pedals you dont think i could use the 69 manual pedal setup?