July 20, 2019, 11:45:24 AM

Author Topic: SBC T5 questions  (Read 302 times)

Offline AGreen

SBC T5 questions
« on: February 26, 2019, 08:36:35 PM »
I recently finished swapping an L98 (1st Gen SBC) into my 88 convertible, but it came with a 700r4.  After driving the car around a bit, I realized that I'm not having fun in my fun car, so I found a T5 to swap in.

Yes, I know that:
-Gen 1 SBC don't make as much power as Gen 3 small blocks
-The T5 is not a strong transmission

I just want my car to be fun again. I already am limited on power because of the stock NA FC differential, so I'm taking it easy on it. At least until I can afford to swap in an 8.8 IRS. But, for now, I got a cheap T5 to put in and enjoy for a little while.

My questions:
-Does the offset transmission from the 3rd Gen Camaro have any fit issues with the FC tunnel?
-It looks like the slave cylinder won't fit right, so is there a concentric slave option that is known to work, or should I just use the pull type slave?
-Does the shifter find its way into the right place, or do I need to do more fabrication?
-Does the 700r4 driveshaft match the T5?
-Do I need to change the starter as well?

Just trying to hammer out any surprises before I take it back down after literally just finishing getting it on the road again.

(I should have put a V8 in this car long ago)

Offline DDv8

Re: SBC T5 questions
« Reply #1 on: February 26, 2019, 11:26:24 PM »
 which t5 did you get? v8 version or v6.  v8 is ok gear ratio wise, v6 has poor gear ratios with stock rear end.

1.  you need to get a straight up bell housing from any standard Chevrolet from the 60s to the 80s, come in 10.5, 11 or truck(needs centering ring).

2.  I have a pull style in mine with shortened fork and clutch is very stiff.
    Concentric type https://www.jegs.com/i/RAM-Clutches/798/78137/10002/-1   need a master cylinder adapter to rotate master upright, new  master of proper volume for slave.
    3td option is to use stock master and slave in a push arrangement with a shortened fork and custom slave bracket  see https://www.norotors.com/index.php?topic=86.0 bikedad build.

3.  shifter will be at the forward edge of hole. use off set shifter handle. 

4.  t5 is longer https://help.summitracing.com/app/answers/detail/a_id/2505/kw/gm%20automatics/related/1  than a 700r4 https://help.summitracing.com/app/answers/detail/a_id/2502/kw/gm%20automatics
     you might get lucky and your drive shaft can take up the 5/8 difference

5.  no, if you use a 164 tooth flywheel  for whatever rear main seal you have.  This has relation to question # 1  as you have to use an 11" bell housing.

the search function does work.  There are a few sbc 5t builds and a few t5 threads.

anymore questions  post here Ill try to answer.

86fc old school 327, T5, converting to 8.8 tbird

Offline AGreen

Re: SBC T5 questions
« Reply #2 on: February 27, 2019, 09:04:55 AM »
I got the transmission from a 305 IROC. It does have the offset bell housing. I saw that some used it, but some say it can't be used. Makes me wonder why there is an argument.

There are just so few builds with people using the T5, the information seems pretty limited. I get that it's a weaker transmission, which is why it doesn't get used and it's not covered as much.

Everything sounds in order except for the bell housing question then. I think I read through bikedad's thread, but I'll give it another look.

Thanks for the advice.

Offline DDv8

Re: SBC T5 questions
« Reply #3 on: February 27, 2019, 09:19:11 PM »
The rotated bell puts the shifter into the side of the tunnel and I think the slave bracket gets into the floor.

 brief history  82 f body had super t10 4 speed offered and was designed for the side shifter on that trans.  t5 trans offered in 83 so to keep tunnel and floor the same GM rotated the t5 to move the inline shifter toward the driver, the stock shifter is oppositely bent to put the shifter strait up in the offset location.

my t5 sbc seems to be working fine so I can answer most questions also running na posi rear.  I have stock size tires so they are the first thing to give up....
I do not have build thread but I do have a few picts.

86fc old school 327, T5, converting to 8.8 tbird

Offline AGreen

Re: SBC T5 questions
« Reply #4 on: February 28, 2019, 11:38:28 AM »
So it will absolutely not work with the angled bell housing, or it requires some amount of modification to make it work? I really wonder because I keep looking at the trans and can't honestly see why it won't work the way it is with a little effort on my part. I'd really hate to have to search out for a straight bell housing after I've spent a literal 3 years searching for a decent T5 to use. Not because I couldn't find one, but because I wasn't willing to spend over $800 for a high mileage T5 that has a bad reputation in the first place. If now I'm locked into finding a straight bell, it's probably not worth the time and money to make it work.

Hell, I'll probably just shut up and mock it up in there to see exactly what the extent of work is necessary to make it work. Worst case scenario, I'll fix the leak on the 700r4, install a shift inprover kit and put it back in.

Offline freeskier7791

Re: SBC T5 questions
« Reply #5 on: February 28, 2019, 08:59:48 PM »
Look at my thread, i built a plate to rotate my T5 upright and used a push type slave.  Running an LT1 and later ford pattern case

Sent from my SM-G920V using Tapatalk

Offline rk970

Re: SBC T5 questions
« Reply #6 on: April 06, 2019, 11:53:57 AM »

starting on post #17 is how i did my clutch slave mounting.  https://www.norotors.com/index.php?topic=2877.0

with this bellhousing.