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Old 04-19-2003, 02:23 AM
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Post Beefing up my drivertrain?

Hey, folks, looking for some advice. As you might have read in other posts, I have an 89 Mustang convertible I'm working on. Right now, it is pretty much a stock 302 with an AOD.

I've got a three phase plan for the drivetrain. Phase one is to get the tranny and everything behind it up to strength. Phase 2 is to build a stronger engine. Depending on how I like the drive at that point, I may go to phase 3, which would be a mild supercharger. In all of this I am just wanting a very strong yet reliable daily driver, not planning on taking it to the track or anything like that.

So I want to build the engine, transmission, and everything else strong enough to take the power from the supercharger in case I go that way.

On the transmission, I am planning to pretty much follow the advice of Baumann Engineering (I think).

My question is the u-joints and differential. Should I do anything special there? Will stock hold up, or do I need to look for something beefier?

Any thoughts would be appreciated. (Including telling me thw whole idea sucks )

Thanks, Frank.

[ April 19, 2003: Message edited by: cajunstang ]</p>

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Old 04-19-2003, 07:25 AM
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Your tire size and footprint will determine how much traction you will have, as long as your not dropping the clutch all the time your stock components will survive...for a while.

If you like you can get stronger u-joints and retaining caps for the diff, c-clip eliminators for the axles.

How much power are you thinking? How much tire are you going to install?

Here is a link to a project I assisted in last year to make a 91 Mustang 5.0 road racing/slalom worthy, that engine was approaching 300HP and had no problems with the driveline other than axle location and hop problems. The custom bushings I made combined with the aftermarket parts installed really transformed the cars handling. The stock axle and 5 speed trans is original equipment and has seen a lot of abuse, no problems yet.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

— Han Solo
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Old 04-19-2003, 10:30 PM
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My nephew has a 89 Mustang 5 speed with a Super Charger and Nitrous.......Everything from the tranny back is stock.......Turns 11.15 every weekend at the track....Has had this setup for a year and a half with no probelms with the drive train!!!!
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Old 04-21-2003, 09:41 PM
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You have it a bit easier since it's an AOD, no issues with dumping the clutch, twisting the axle, etc. The differential itself should be more than capable of handling the power since it's 8.8". The only thing that you might want to upgrade is a stronger u-joint and retaining cap, although the stock ones should take the abuse depending on how much power you're going for. But as I've learned, an ounce of prevention is worth a pound of cure.
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Old 04-22-2003, 02:06 AM
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Thanks for the replies. As for horsepower, I would guess tha the top end would be somewhere between 400 and 500. I'm still thinking about it (and that takes me a while).

A couple of people have mentioned stronger U joints. Any specific brands or specs I should be looking at?

Thanks again,

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Old 04-22-2003, 02:15 PM's Avatar Moderator
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Good brand name that is 'permanently lubed' is the usual high strength approach for street/strip cars. Greaseable U-joints with a zerk fitting are cross drilled which weakens them while the permanent lubed ones are solid and thus much stronger.

[ April 22, 2003: Message edited by: ]</p>
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