ion05

Have a 91 foxbody with 4l60e and 8.8 rear end using AJE Kmember and stock trans crossmember was wondering whats the maximum angle the trans and rear differential can be apart? seems that my trans 4l60e sits a bit higher than the 8.8 rear differential and was wondering how many degrees of angle can it be?

v8sten

iTrader: (5)

Depends on your rear suspension. If its bushed 2.5-3 degees. If its solid 1-2 degrees.

krochus

iTrader: (1)

Coming from jeep wranglers to mustangs I simply cannot imagine a scenario where you'd have an angle extreme enough to be anywhere close to becoming an issue

The driveshaft angle isn't important as much as the pinion angle is. For a single cardian universal joint the trans output and pinion need to be parallel to each other.

ion05

so is it 2.5-3 degrees or it dosent matter? im confused

krochus

iTrader: (1)

It means that for either of us to answer your question you're going to have to spend some time under the car measuring angles.

How much off is the pinion angle from the trans output angle?

Remember that your driveshaft angle ISNT the number you get compared to the earths horizon. It's the difference you have relative to your transmission/pinion angle.

stangtrader

iTrader: (2)

I wouldnt be surprised if its out pretty good.i checked mine due to a bad vibration. Tail of my trans was down 5 deg and dif was up 1 degree.i had to shim the th400 up off my aje trans crossmember a good 2 inches.it did however tear up my aje engine mounts changing the angle from what they designed

krochus

iTrader: (1)

This is what is important. ^

That the pinion angle matches the trans angle. The proper way to correct this mismatch would be with adjustable upper control arms.

The. 3. Degrees or so down on the pinion rule from the trans angle is to account for pinion climb under acceleration. Again the driveshaft angle is largely irrelevant within reason

v8sten

iTrader: (5)

Basically don't worry about the angle on the trans. Work on the pinion angle. Go to harbor freight and get you a cheap angle finder. Put it on the drive shaft tube, write that angle down. Then put the angle finder on the face of the pinion flange, where you bolt the 4 bolt flange too, and then write that angle down. Subtract the difference of the 2 angles. That is where the 2.5-3 degrees should be. 2.5-3 is an aceptable range you need to be in if you have bushed control arms. The lower control arms adjust the location of the axle and the uppers adjust the pinion angle.

krochus

iTrader: (1)

I just want to add that most smartphones have angle finding apps that are amazingly accurate that can be used in a pinch or as a quick rough check