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Unread 04-19-2010   #1 (permalink)
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Default 1978 4speed coversion to t-5 help

hey there got my first mustang. I am still a camaro guy lol. i have a 1978 mustang II with a bad 4speed. my question is how to put a t-5 in one. what all do i need is it just shorting the drive shaft? i have been reading a lot of your forums and see automatic to t-5. so if i get a t-5 what else should i buy? is my clutch going to work and the bellhouseing too? thanks all info would be great. i have a v8 302 that will be getting new cam and other goodies. i heard the 4 speed cant handle 200HP.
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Unread 04-19-2010   #2 (permalink)
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There are a few ways to do it. The simplest would be to use the T5 bellhousing, spacer plate, clutch and flywheel, although you would have to get the flywheel rebalanced from 50 oz. to 28 oz (unless you also swap to a newer 302 ith the 50 oz balance).

Then you will need to slightly modify the tranny x-member and driveshaft.

A buddy of mine did his years ago, and simply drilled new holes in the X-member and found a driveshaft/yoke combination that was the proper length...
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Unread 04-19-2010   #3 (permalink)
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so if i bought a 28oz flywheel instead of using my stock 50oz i would be fine? what year mustangs had the 28oz?
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Unread 04-19-2010   #4 (permalink)
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You will need to get a 28oz flywheel with the correct diameter/toothcount (pre-81 302 or any 351W would be where I'd look first) or mod the RAD4 bellhousing, etc. as some of the online writeups state.
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Unread 04-19-2010   #5 (permalink)
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1) How well does the T-5 bellhousing fit in the tunnel? Ford went to the smaller bellhouse for clearnace issues I thought.
2) Going with the T-5 bellhousing, you would have to go with either a cable or hydraulic clutch set-up. With the T-5 housing, you have no need for a spacer. Spacer only used when reusing the old bellhousing. Got an example laying around here somewhere.
3) You can not just change the flywheel and balancer to what ever without matching what the motor was designed for, flywheels are different also. Think it was '82' when the balance change was made. Modern Drive Line specializes in the swaps.
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Unread 04-19-2010   #6 (permalink)
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It's not horsepower that will wreck a transmisson, it's torque. The actual power of the engine. I'm building my 302 to around 300 horse and 300 foot pounds behind a Rad and seeing how it goes. Everyone says it's gonna blow up but no one seems to know what does go to hell when it does.
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Unread 04-19-2010   #7 (permalink)
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Torque is indeed how the transmissions are rated, Ford rated they're for 100K miles. A lot of the Mustang T-5's are well under that 300 ft-lbs but would last for a long time. Best bet for that trans is check with someone who really know about them. Very limited knowledge on them. Would an old top loader/T-10 be a fit if you're not worried about OD?
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Unread 04-19-2010   #8 (permalink)
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The T5 fits the tunnel fine. Its a bit crowded, but even long tube headers will fit with it.

No problem with the clutch cable. Both the RAD4 and the T5 are cable-activated.

The swap of the flywheel is ONLY because the T5 was only used behind the 302 with a 50 oz. balance, so the flywheel would need to be rebalanced to 28 oz (or changed possibly to the 28 oz. 351W one) in order to match the engine's original specifications.

AFAIK, the change was made at the end of '80, as the 81 Mustang flywheel sitting beside me is a 50 oz. balanced unit...(which is why I am not using it in my own swap)
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Unread 04-19-2010   #9 (permalink)
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you need the mustang II bell, a 94-95 T5, and you need a pre '78 engine with the 28oz balance and you need the mustang II flywheel and the mustang II oilpan.
I have uploaded pictures of my car I am using the 94 T5 with stock bell.
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Unread 04-20-2010   #10 (permalink)
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Quote:
Originally Posted by Dave View Post
Torque is indeed how the transmissions are rated, Ford rated they're for 100K miles. A lot of the Mustang T-5's are well under that 300 ft-lbs but would last for a long time. Best bet for that trans is check with someone who really know about them. Very limited knowledge on them. Would an old top loader/T-10 be a fit if you're not worried about OD?
Dave
Sadly no, it's quite a bit larger and various other things make it far harder to do than the T-5 swap. I just don't have the money for a T-5.
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Unread 04-20-2010   #11 (permalink)
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Try finding a "RUG" or SROD.

Similar to a RAD, but third is 1:1 and 4th is an overdrive. It should handle the torque...
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Unread 04-20-2010   #12 (permalink)
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Quote:
Originally Posted by Blue_coyote View Post
Try finding a "RUG" or SROD.

Similar to a RAD, but third is 1:1 and 4th is an overdrive. It should handle the torque...
Also a pain in the butt to put in and also a large pain to find cheaper than a T-5.
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Unread 04-20-2010   #13 (permalink)
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would a t/10 work i heard those are pretty good? thanks guys for the info
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Unread 04-27-2010   #14 (permalink)
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i believe a t10 is about the same size as a toploader, but i don't know if the bolt pattern, input shaft length, or spline number will fit. t10's were usually found in GM cars i think.

not trying to get off topic too much here...but i'm looking to put a toploader in my II behind a 400. i think it's a more reliable choice over the t5 considering the torque the 400 puts out. question is, does anyone know if the big block bellhousing (same as the 460) will fit without cutting the firewall? and the toploader for that matter?
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Unread 04-27-2010   #15 (permalink)
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i found a shop here in minnesota that will rebuild my 4 speed for 400 bucks. i will probly swap them out over winter
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