Rear end identification?

[Shalpass]

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any ideas or how I would identify it to know what gearing?

 

[bucket]

Look at the sticker in the glove box or in the left inner fender (if it's still there). Or look up the numbers that are faintly stamped into the forward face of the passenger side axle tube. Or pull the diff cover and look at the numbers stamped into the ring gear.

 

[Shalpass]

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here is the sticker under the hood but I believe the guy at the oil change place said it looked like it had been changed out....so it should be stamp on the forward end of it?....near the ujoint

 

[kleedus]

10 bolt

pull the cover get the numbers off the ring gear divide them and you have the ratio

41 11 3.73

41 10 4.10

 

[bucket]

Says it is the standard ratio. But the "standard" ratio varies with other equipment, so that's not much help. Standard for your truck was likely 3.08 or 2.73 ratio. My '84 was basically optioned the same (no sticker though) and it came with a crappy 2.56 ratio, but I would have to guess it was an optional "economy" ratio. But that's just my assumption.

Why did they tell you it looked like the axle was changed? That pic shows no evidence.

 

[RetroC10Sport]

2.56 if it's original since it has the 305 and 3 speed.

 

[bucket]

2.56 if it's original since it has the 305 and 3 speed.

That makes my assumption wrong then

 

[RetroC10Sport]

2.73 was the only option with that drivetrain.

 

[Shalpass]

Well I ran out of time this week . I'll have to . Check . Next week...I was hoping you might be able to tell by the looks kinda like with tranny sometimes...I'll be pulling cover off diff to check here in about a week

 

[Shalpass]

2.73 was the only option with that drivetrain.

You say this with hard evidence ...so is this the case ?. Still gonna pull and look need to change gear oil anywho

 

[RetroC10Sport]

You say this with hard evidence ...so is this the case ?. Still gonna pull and look need to change gear oil anywho

100%. But yours could have been changed out at some point, it is 30 years old after all.

 

[gpmorgan]

You say this with hard evidence ...so is this the case ?. Still gonna pull and look need to change gear oil anywho

That would be a good idea. It might have 30 year old oil in it. Just count the number of teeth on the ring and pinion gears and divide the ring gear number by the pinon number. Ring divided by pinion equals ratio.

 

[Shalpass]

Gonna pull the. rear differential cover today flush and fill up....I have gasket maker, brake clean, gear oil 80w-90....can I spray brake clean on gear and in case with cover off...won't hurt anything I'm assuming....while I have cover off gonna see what rear end it is along with cleaning cover and giving it a fresh coat of paint....any helpful tips on this job is much appreciated

 

[Shalpass]

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well I counted the teeth may be off one or two but I got 46 and 20 that's 2.3 rear I may be off a tooth or three could be 44 and 18 or something close to that....any guesses.......painting the cover while it's off

 

[highdesertrange]

you counted wrong. you have way to many teeth on the pinion. highdesertranger