hey guys i have an '87 1/2 ton p/u. yesterday it got hungry and ate the rear end.. I have always assumed it has 3.08 gears how do i tell quickly? i was able to get these #s off the large (41 tooth) ring gear -2 GM 1235128 ?2 41 3 87- the ? i am unsure what that is could be a # or a . thanks for any help
CK5
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a little gear ratio help please?
- Thread starter 1badv10
- Start date
readymix
3/4 ton status
looks like 3.42 to me
[ QUOTE ]
looks like 3.42 to me
[/ QUOTE ] how do you tell that? cause i need to be sure so i can order the new parts..thanks again.. also i can still read the tag in the glovebox anyone know how to decode for a ratio?
looks like 3.42 to me
[/ QUOTE ] how do you tell that? cause i need to be sure so i can order the new parts..thanks again.. also i can still read the tag in the glovebox anyone know how to decode for a ratio?
Hey,
The last two numbers in that sequence "3 87 " are the month and date stamp. Ring gear was built in March 1987.
The two numbers before that are the ring and pinion ratio "?2 41". In this case there are 42 teeth on the ring gear and that "?2" has probably got to be a "12" for the pinion...it's the only thing that makes sense numerically.
Divide 41 by 12 and you get a 3.42 ratio.....
If you have the RPO code for the rear axle, you should be able to post that here and someone can confirm that it matches what was just calculated.
Good luck.
/forums/images/graemlins/thumb.gif
The last two numbers in that sequence "3 87 " are the month and date stamp. Ring gear was built in March 1987.
The two numbers before that are the ring and pinion ratio "?2 41". In this case there are 42 teeth on the ring gear and that "?2" has probably got to be a "12" for the pinion...it's the only thing that makes sense numerically.
Divide 41 by 12 and you get a 3.42 ratio.....
If you have the RPO code for the rear axle, you should be able to post that here and someone can confirm that it matches what was just calculated.
Good luck.
/forums/images/graemlins/thumb.gif
