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26 - 27 rebuild 4th main babbitt thickness
Posted: Mon Dec 01, 2025 11:07 pm
by Dave1
I am assembling a 26 transmission. Have on hand a good driving plate with the exception of some scouring on the ball cap / 4th main contact area. I have a crankshaft grinder so it isn’t a huge job to turn the bearing contact area underside.
Which will mean an increase in the Babbitt thickness in the ball cap.
I estimate the diameter will be about .035” undersized.
Wondering if any engine builders have tried this?
Re: 26 - 27 rebuild 4th main babbitt thickness
Posted: Mon Dec 01, 2025 11:14 pm
by Kerry
Do it all the time, machine the drive plate and increasing the thickness of the babbitt and re-machine that to fit, the early ball caps made by dodge had about 1/4" thick babbitt.
Re: 26 - 27 rebuild 4th main babbitt thickness
Posted: Tue Dec 02, 2025 3:04 am
by Dan Hatch
Here is a link to a thread from Herm. Shows how he did a transmission. Look down at how to fix your problem.
https://www.mtfca.com/discus/messages/3 ... 1375578307.
These post should be saved for new guys. Dan
Re: 26 - 27 rebuild 4th main babbitt thickness
Posted: Tue Dec 02, 2025 8:10 pm
by Gene_French
Dave:
the reduced diameter on the driveplate and thicker babbitt in ball cap should not be a problem ... i have seen drive plates ground to 1.500" diameter and there is a variety of ballcap types with babbitt lining from probably .030" per side to around 1/4" per side ... i believe the 1.500" was to fit a ball bearing ball cap ...gene french