what gear ratio is it

[Guest5979]

I picked up a 1969 or 1970 full size blazer rear end 4 wheel drive 6 lug. I would like to find out the gear ratio it is. This is the number stamped on the axle housing tdf 0625w2.it will be going in my 52 truck
thanks
robert

 

[David Hall]

The most accurate way to identify the ratio is to pull the cover and look at the ring gear stampings. If the housing has a tag, the gears could have been changed.

From my experience the housing cast numbers don't reveal the ratio, instead they show the axle type: GM 10, Corp 14, Dana 44 ...

http://coloradok5.com/axleguide.shtml

 

[Guest5979]

thanks

thanks David
will pull cover than

 

[2tons of fun]

i can tell you right now it will most likely be either 3.08 or 3.73. you might get lucking and somebody swped in 4.10 or better but never count on it.

 

[2tons of fun]

there might be a small metal tag on one of the diff cover bolts. you will probably just have to pull the cover off and drain the diff, the ### will be on the ring gear about 1/8" tall.