The Corvair Differential Discussion + POSI + 4 SPIDERS

[66vairguy]

South Coast Corsa posted an interesting, and basic, article about the Corvair differential by Dan Drommerhausen. Dan has been rebuilding Corvair transaxles for decades. The article is meant to explain how the differential works to anybody.

It does cover how the Positraction works EM vs LM, limited slip lubrication, and the modification from two to four "spider" (common term) gears.

Log in to download PDF file -----

[Gotta_65_Vair]

South Coast Corsa posted an interesting, and basic, article about the Corvair differential by Dan Drommerhausen. Dan has been rebuilding Corvair transaxles for decades. The article is meant to explain how the differential works to anybody.

It does cover how the Positration works EM vs LM, limited slip lubrication, and the modification from two to four "spider" (common term) gears.

Log in to download PDF file -----

Good review of the differential. Thanks for posting.

[bbodie52]

The differential "snout" should be inspected for cracks or damage, as this is a cast machined part and is subject to damage if the input shaft is allowed to press laterally against it while separating the transaxle from the engine (the long input shaft is splined at both ends, and the shaft can pull out of the transaxle while remaining embedded in the clutch while separating the engine from the transaxle. If you allow the weight of one heavy component to lever against the shaft, it may press against the "snout" and crack it. Replacing this part of the differential requires completely dismantling the differential, as the "snout" has to be removed from the inside of the differential housing.

It is worse than that! I believe you have to gut the case to remove it from the inside. Have you ever seen the process for aligning the ring gear and pinion backlash and contact pattern???

Part number C7463: THROW OUT BEARING SHAFT FOR 2 SEALS NEEDS(2)SEALS-60-63=C494,64-69=C495 & 1 C1179

Weight: 1 lbs 4 oz
Catalog Page(s): 124(14)
Price: $ 59.60



https://ssl.corvair.com/user-cgi/catalo ... w_page=124

[66vairguy]

Good post Brad. This is why I always pull the entire drivetrain before pulling the transaxle off the engine. I've run into a few damaged/broken parts from folks tying to get the engine and transaxle apart IN the car.