INTENESS

iTrader: (4)

I recently purchased a new driveshaft for my th-400 chromemoly driveshaft,I think its too long I slide the yoke entirely in tranny and after muscleing it into the rear.I have 3/16" play in the yoke I would think i need at least 1/2" to 3/4" to work.Also took for ride and get a vibriation that wasnt there with the old shaft.I bought this used it is a mark williams driveshaft 3".I can't bring the rear any further back either its as far as I can get it.

Pocket

iTrader: (22)

Lift the car and put the jackstands under the axle, so the rear suspension is at approx ride height. Insert the yoke all the way into the trans. The U-joint should be approx .75-1" from the rear yoke

Too little play and you risk a bind which kills transmissions and turns the DS into a bad thing. Too much and the yoke doesnt have enough coverage to remain perfectly strait on the output shaft

INTENESS

iTrader: (4)

I put the car on ramps all i have for play is 3/16" too long it is then.

Pocket

iTrader: (22)

Shoot the shop that built it an email with your problem. If they tell you to stick it, then take it to a local DS shop and have it shortened. The only measure they need to know is the distance from the tip of the output shaft to the CL of the U-joint yoke on the rear. Shortening is inexpensive

runtwrestlin

iTrader: (3)

Sucks man. Good call on getting it shortened. Mine had about the same amount of play after my rear end install, until I hit an intense bump and the DS busted the seal on the tranny. No severe damage, but I know it could've been worse.