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Hello,
The decision to rebuild the current transmission solely depends on the condition of the transmission. What usually makes the decision for us is the condition of the bearing surfaces inside the cluster gear. And to inspect that, you have to completely disassemble the transmission as it's the large piece at the bottom of the transmission that has all 4 gears and reverse.
We, my brother actually, rebuild 5-6 Volvo transmissions every year and I almost always have the needed parts in stock.
You can physically bolt in any M41, Volvos designation for the 4 speed with Laycock overdrive used on any of the 4 cylinder b18 and B20 pushrod motors, but there are some differences and sometimes extra work is required to make them fit properly.
You might have to change the output flange to match your driveshaft and if you have an early M41 that uses u-bolts to hold the driveshaft to the transmission, you would have to modify/change the driveshaft to use a later M41. Sometimes, we have to replace the reverse shift rail to match the shift cover being used. Early 1800 shift covers have the reverse light switch on top of the shift cover, while later versions and versions used on 122s and 140 have the reverse light switch mounted elsewhere on the transmission.
FYI, rebuilding any of the Volvo transmissions, including the M41s isn't cheap, but we only use high quality parts, a good portion being original Volvo parts or the same brand Volvo used.
I also have rebuildable cores if needed.
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Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com
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