3 Speed Bolt out Swap for M20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

raycow · 10-08-2010, 02:45 AM

Saskgreen, the good news is, you may not have to buy a spacer ring.

All the 4 bolt transmissions I have seen had the small size bearing retainer, and they wouldn't have come stock in a 70, so I think you are looking at a transmission swap done by the PO. If he did his homework, he would have used a spacer ring, or else swapped an earlier bellhousing. Either way, you are good to go with the Muncie.

Worst case, the PO ignored the center hole mismatch and just bolted the early transmission to the 70 bellhousing without a spacer ring. In that case it would still run, but not for very long. Is the 3 speed dead now, or does it still drive ok?

Ray

10-08-2010, 02:45 AM	#21
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: 3 Speed Bolt out Swap for M20 Saskgreen, the good news is, you may not have to buy a spacer ring. All the 4 bolt transmissions I have seen had the small size bearing retainer, and they wouldn't have come stock in a 70, so I think you are looking at a transmission swap done by the PO. If he did his homework, he would have used a spacer ring, or else swapped an earlier bellhousing. Either way, you are good to go with the Muncie. Worst case, the PO ignored the center hole mismatch and just bolted the early transmission to the 70 bellhousing without a spacer ring. In that case it would still run, but not for very long. Is the 3 speed dead now, or does it still drive ok? Ray Last edited by raycow; 10-08-2010 at 02:46 AM.



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