T5 Swap on a 351W

Does the T5 bellhousing accomodate the 164 teeth flywheel of a 351W? or it can only the the 157 teeth flywheel from a 302 or 5.0?

This is exactly my combo. The T5 bellhousing fits the 157 tooth flywheel. However, the 351w is 28oz balance, not 50oz like 1982 and later 302's. (or 5.0's)

so, you must have your flywheel balanced to 28oz. Preferably matched to your rotating assembly.

Chris

Until I built a roller motor I had a T5 behind a 302 with a 28oz imbalance flywheel in my fox body mustang. I know there's factory flywheels out there that will fit.

OK, could someone who has put a T5 behind a D4 block 351w, in a 68 stang or cougar weigh in, what pieces are needed, what has to be fabbed, etc, and why should i put a t5 in a 68 cougar when i have a fresh toploader ready to go? A couple of guys think i'm stupid to use a four speed when t5's are "cheap", I have a really tall nine already, and the pedal set, give a bell and clutch and i ready.

I have a 65 fastback with a roller 351W, and T5. I have run it n various combinations with stock bellhousings, scattersheilds, toploaders, with the old style 3 finger pressure plates and with diaphram style pp's.

If you want to use an old style (3 finger) clutch&P.P you can use a 157 tooth flywheel from a 289 or early 302 (28 0z-in) and an old style clutch throwout fork with the newer style T5 bellhousing. This works but I prefer the following setup: Get a 157 tooth flywheel from a 80's 302 these are 50 oz-in in ballance and have your local machine shop reballance it to 28oz-in (this is easy for them to do and takes about an hour) you can then use a cable linkage and diaphram style pressure plate. The cable linkage is a bit of a hassle but it feels better. I found even with a chained down motor you get a lot of torque action transmitted through the clutch pedal with the old Z-bar setup. I made my own cable linkage, but Mustang Steve sells a kit, I can't vouch for his particular kit because I have not used it, but other kits he sells are very good.

From 1979-1984 the flywheels in the 302 Mustangs used a 10" clutch. The 1985 and newer used a 10'5" clutch. The flywheel diameter was the same throughout. From '79-'81 the flywheels were of the 28oz version.

If you want to use an 80's flywheel there is a 28oz unit already available('79-'81). If you want the 10'5" clutch(recommended for performance apps) then do what the earlier poster recommended. If you just want to bolt it on and go without drilling out material and weakening the flywheel's integrity get a '79-'81 unit. I have used a T5 and T5 bellhousing with both of these on a 5.0 and the bolt pattern is the same for a 351. Your only issue would be what type of clutch mechanism you want to use.

I'm not sure about the configurations of the '78 and older units but they may work too.

All that said I don't recommend a T5 behind a 351. Even the best is only rated at 330 ft/lbs of torque and the stock one is rated at 265. The only stock ones that aren't are the '91 and newer units, 305 and the Cobra units, 310.

The top-loader is a super strong unit but the gearing choices are only two; Wide ratio and close ratio. Wide ratio has a first gear around 2.95 and the close ration is way lower. Neither one is well suited for a tall rear gear. The stock t-5 has a first gear of 3.35 but is of the lower rated torque of 265(unless it's a newer model or the heavy duty trans). The heavy duty T5 is rated at 330 but it's first gear is 2.95 so you're back where you were with the Top Loader and the Top Loader is way stronger. having a fifth gear is great for the highway though.

Whatever you do, good luck with it.

Thanks for all your replies guys. In short, can I use the existing 164 teeth flywheel that comes with the 351 or do I have to buy a 157 teeth flywheel. While you are at it, anybody can tell me which flywheel this code corresponds to EIZR 6380-A2A?

Thanks again.

If you use the 164 tooth flywheel, you wkill need the engine plate to go with it. the 164 tooth f/w is larger than the other and needs the starter relocated. You will have a hard time fnding a stick shift plate for the 351, but the plate from a 302 using the same tooth count will work. I don't know the years that will work. Bellhousing may need to be that size too.

where can I "decode" a flywheel. I know its from an 81 stang, with a stick, but I have no idea of its balance. It could be from a V8, or a 6 cylinder, I think. Thanks