Guys I have a serious issue with my box or diff, was giving it some beans earlier round a roundabout and the back end decided to kick right out like I was running only rear wheel drive? This may sound odd but thats my best explanation, it was like I had gone round in my old RWD 3-Series with the front not pulling like it usually does to correct as a 4WD should. Straight after I noticed that my revs where really high but I was barely moving. The car is driving like a Land Rover stuck in low range, ive got all forward gears and no clutch slip but am only getting like 35 mph in fourth reving at 6k?!?! Also reverse gear selects fine and doesnt pop out but is really whiney?!? I have upgraded the gearbox to a 754 from a later uk spec car and I have installed the matching rear diff and changed one of the rear driveshafts so its got the limited slip. The clutch is brand new uprated exeedy and since putting the clutch and box in I have only driven the car for about an hour total. Any ideas on what I have done as I have no way of getting all four wheels of the ground until the weekend and I cannot see any obvious damage?

 

Is there a chance I have popped a driveshaft out?

 

Yeah sounds like it

 

Thats a relief thanks fella

 

I dont think it is a driveshaft, you would hear knocking, id say you have naffed a differential up, hence your ratio's are screwed.

Tony