VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1912-1928 Driveline question 1928 LP truck

I am using a correct but different motor, correct but different tranny with original rear axle assembly on a 28 truck. I see a shim under front of motor and one on each side of trans assembly attaching to frame. Any driveline alignment issues I need to beware of? Or just throw it in there and let her eat. LOL Thanks

Hi Spyphish,

What is the shim material and thickness? Any photos? My '26 chassis with '28 motor and transmission did not have any shims. Once i restored it, I tried SBR washers between the frame and mounts to see if it made any difference in engine vibration transferred to the frame (no noticeable difference).

Long story short, I doubt you need any shims for drivetrain alignment as long as you don't have any binding issues at the universal joint, I'll be curious what others' experience has been.

-Tyler

My two trucks have spacers that go in between the transmission cross member and the chassis mount brackets. They are flat plate material, 1/8" thick (if I remember correctly), roughly 1 1/2" wide, and 3 1/2" long. They have a long slot cut longways that span both mounting bolts on each side of the transmission.

I might have a pair of these spacers in my parts stash. I'll look for them and if I find them, I'll add a photo to this posting.

You bolt the transmission to the back of the flywheel housing, put the tranny side mounting bolts in loosely, and then hammer in the spacers from the top to slide over and around the side bolts. These spacers center the transmission and make the sideways fit to the chassis tight.

Neither of my trucks use spacers on any of the engine mounts.

Cheers, Dean