Would This Fit On Johnson

[another fish tale]

I Have A 1978 70 Hp I Found A 1975 Lower Unit 70 Hp Would This Work ?the Guy Wants 75.00 For It

 

[jwilkey84]

Re: Would This Fit On Johnson

I think it might. I have been told there was a change there about I think 78 or 79 so your best bet is to make sure it bolts up the same, the shafts have the same number of splines, and they are both the same length.

 

[HighTrim]

Re: Would This Fit On Johnson

I was told that 1977 to 1988 should bolt right up, yours in in that range, so I dont think that the 1975 will work . The main thing is that it shifts the way as yours and that the driveshaft splines are the same . In 1989 they went to a fine spline arrangement on the top of the driveshaft, so they would also be out of spec for your use.

 

[R.Johnson]

Re: Would This Fit On Johnson

I can never remember what years apply without looking in the service manual, but you may have to change the shift linkage at the powerhead to make it work. Without this change the shift pattern would be reversed.

 

[another fish tale]

Re: Would This Fit On Johnson

Thanks

 

[ezeke]

Re: Would This Fit On Johnson

The 77 does not match up with the 78 either. Look for another 78 or newer. Look for the skeg that is angled back at the rear, rather than straight down.

 

[HighTrim]

Re: Would This Fit On Johnson

So Ezeke is it usually safe to say that from 78 to 88 are proper matches, as long as the driveshaft splines are the same as well as the same shift?

 

[another fish tale]

Re: Would This Fit On Johnson

thanks for your help i decided to put a 115 on that boat i have one collecting dust will put on 1979 glastron gt 150 and when i fine a lower unit for 70 hp i will use for backup instead of buying lower unit i bought from my friend 2- 20 hp johnson motors