BrettM
NAXJA Forum User
- Location
- michifornia
I have a BA 10/5 speed tranny (1988) and am going to swap an AW4 in soon. I already have some 4.88 gears, and I'm concerned about getting my OD RPMs right, meaning I need to decide on getting an AW4 with .70 od or .75 od.
Eagle said very specifically that the OD 5th on the BA 10 is .72, and I tend to believe him. BUT, the other day I put the speedo at 65 in 4th and it was 2600 rpm, then I shifted to 5th and matched 65mph again and it was 2050. According to my calculations that is a .79 ratio, which is what I thought it was before, and is what the AX15 is.
If it is .72 then I can go ahead and get a .70 AW4 (cheaper) and my RPMs will be fine.
If it is in fact .79 then I need to find a .75 AW4 to keep my RPMs in the right spot.
arrrghghhh
thanks guys
brett
Eagle said very specifically that the OD 5th on the BA 10 is .72, and I tend to believe him. BUT, the other day I put the speedo at 65 in 4th and it was 2600 rpm, then I shifted to 5th and matched 65mph again and it was 2050. According to my calculations that is a .79 ratio, which is what I thought it was before, and is what the AX15 is.
If it is .72 then I can go ahead and get a .70 AW4 (cheaper) and my RPMs will be fine.
If it is in fact .79 then I need to find a .75 AW4 to keep my RPMs in the right spot.
arrrghghhh
thanks guys
brett