Will an Alpha 1 lower work...

[WizeOne]

...on a Merc 1 upper. The Alpha 1 lower is mid 80's and the Merc 1 (MR?) is a '78.

 

[Ohioriver]

Re: Will an Alpha 1 lower work...

The older lowers use a preload pin on the drive shaft, the newer, sometime in the 80 don't. You will need an experts advice on this one.

 

[dubs283]

Re: Will an Alpha 1 lower work...

The older lowers use a preload pin on the drive shaft

true, but has nothing to do with the upper

i believe when ordering replacement lowers from merc or seirra, you can only get alpha one lowers, the I lower is NLA

there may be some rear pin alignment issues but other than that you should be in the clear

 

[Bt Doctur]

Re: Will an Alpha 1 lower work...

Should bolt up just fine .A Series 1 fine spline will accept the R.MR,Alpha1 types.Pre 74`s ( ?)with the coarse spline only accept a coarse spline driveshaft and do not interchange with the late model drives
Alpha GEN II`s only accept GEN II types..

 

[Bondo]

Re: Will an Alpha 1 lower work...

on a Merc 1 upper. The Alpha 1 lower is mid 80's and the Merc 1 (MR?) is a '78.

Ayuh,... It should work Just Fine...
I believe the spline count changed earlier in the 70s...