Welded Diff HELP - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kouki95 · 05-27-2014, 01:13 PM

So i plate welded my diff and one of the plates was welded closer in on one i\side of the diff. Now i cant get my out put shaft in. I think if i grind five threads to put the shaft in it will slide right in and work. My question is would this majorly effect my diff or cause any serious problems

g14novak · 05-27-2014, 02:47 PM

I would highly recommend against grinding anything that makes metal on metal contact with another surface. It *could* work fine. Grinding down the teeth is going to make micro grooves in the teeth. These grooves are going to wear into the diffs output shaft grooves. Whether this can lead to premature failure is unknown. You could snap the modified shaft in 3 days. You may take them out 3 years down the road to swap to a kaaz or Cusco unit.

What I can recommend is buying another welded diff for $50 and make sure its done proper & perfect the first time.

The last thing you want is something binding and the diff locking up while your doing 70mph down the highway.

If it's a race car, disregard all warnings above. Blow it up or win the race trying. Because race car.

oni jake · 05-27-2014, 03:06 PM

I assume you're talking about grinding less than a half inch off of the input shaft; not enough to pass the lock ring.

If this is the case, do it. It probably wouldn't cause a problem at all.

If you have to grind past the lock ring, then yeah, you fucked up. Restart project over again, and this time don't fuck it up!

05-27-2014, 01:13 PM	#1
kouki95 Join Date: May 2013 Location: portland oregon Age: 32 Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	Welded Diff HELP So i plate welded my diff and one of the plates was welded closer in on one i\side of the diff. Now i cant get my out put shaft in. I think if i grind five threads to put the shaft in it will slide right in and work. My question is would this majorly effect my diff or cause any serious problems

05-27-2014, 02:47 PM	#2
g14novak Zilvia Member Join Date: Aug 2009 Location: FL! Posts: 168 Trader Rating: (1) Feedback Score: 1 reviews	I would highly recommend against grinding anything that makes metal on metal contact with another surface. It could work fine. Grinding down the teeth is going to make micro grooves in the teeth. These grooves are going to wear into the diffs output shaft grooves. Whether this can lead to premature failure is unknown. You could snap the modified shaft in 3 days. You may take them out 3 years down the road to swap to a kaaz or Cusco unit. What I can recommend is buying another welded diff for $50 and make sure its done proper & perfect the first time. The last thing you want is something binding and the diff locking up while your doing 70mph down the highway. If it's a race car, disregard all warnings above. Blow it up or win the race trying. Because race car.

05-27-2014, 03:06 PM	#3
oni jake Zilvia Junkie Join Date: Sep 2007 Location: ---------- Posts: 416 Trader Rating: (5) Feedback Score: 5 reviews	I assume you're talking about grinding less than a half inch off of the input shaft; not enough to pass the lock ring. If this is the case, do it. It probably wouldn't cause a problem at all. If you have to grind past the lock ring, then yeah, you fucked up. Restart project over again, and this time don't fuck it up!