1971 K10 Stepside - Getting a Roller Roadworthy

[loudchevy]

I love the consistent progress! What's next on the list to tackle?

[pjmoreland]

Originally Posted by CUSTOM/10

Those shims are a PITA... I honed out a set of bearings & races to a slip fit to mock-up the gear pattern. I was changing the gear ratio so the shims were totally different. It was still a PITA.

Good looking work.
Gary

Good call on the honed out bearings. That may be in my future if the front or rear gears are noisy.

I was under the impression that the gears in my truck were the original gears since 3.73 was standard equipment, and the SPID doesn't list the ratio. I was reading the optional equipment list in the sales brochure for 1971, and it says a 350 engine gets 3.07 gears. My SPID lists a 350 engine. It is obvious that someone has worked on both the front and rear gears on this truck, so it was probably to swap the original 3.07 gears for 3.73 gears.

['68OrangeSunshine]

Originally Posted by pjmoreland

Good call on the honed out bearings. That may be in my future if the front or rear gears are noisy.

I was under the impression that the gears in my truck were the original gears since 3.73 was standard equipment, and the SPID doesn't list the ratio. I was reading the optional equipment list in the sales brochure for 1971, and it says a 350 engine gets 3.07 gears. My SPID lists a 350 engine. It is obvious that someone has worked on both the front and rear gears on this truck, so it was probably to swap the original 3.07 gears for 3.73 gears.

I'm not claiming to be a total expert, Pat, but from what I've gathered; the 3.73 Ratio was standard for Manual Transmission trucks, while the 3.07 was for Automatic Transmissions.

[pjmoreland]

Originally Posted by '68OrangeSunshine

I'm not claiming to be a total expert, Pat, but from what I've gathered; the 3.73 Ratio was standard for Manual Transmission trucks, while the 3.07 was for Automatic Transmissions.

Hmm. My SPID lists a 350 engine and a 4-speed transmission. Here's the table from the 1971 sales brochure that had me wondering about the gears. The brochure also says that 3.07 will be included with a 350 engine.

['68OrangeSunshine]

OK. IDK.
My '71 GMC Jimmy K/1500 was originally equipped with V8 350/SM465/NP205/ 3.73 w/Posi.
I have a 1972 Chevy K/5 Blazer Tub/Chassis out the 'Back Forty'. While it has no Engine, Transmission, or Transfer Case, and no Glove Box Door [ergo, no SPID], the Rear Differential was a 3.07 when I opened it up and counted teeth. This Blazer was originally an Auto Tranny truck.
Flint build.

[pjmoreland]

Originally Posted by '68OrangeSunshine

OK. IDK.
My '71 GMC Jimmy K/1500 was originally equipped with V8 350/SM465/NP205/ 3.73 w/Posi.
I have a 1972 Chevy K/5 Blazer Tub/Chassis out the 'Back Forty'. While it has no Engine, Transmission, or Transfer Case, and no Glove Box Door [ergo, no SPID], the Rear Differential was a 3.07 when I opened it up and counted teeth. This Blazer was originally an Auto Tranny truck.
Flint build.

Does your '71 Jimmy still have the SPID, and does it list 3.73?

['68OrangeSunshine]

Originally Posted by pjmoreland

Does your '71 Jimmy still have the SPID, and does it list 3.73?

Yes it does. OK. I get it. The Original Buyer _opted_ for 3.73 in his differentials.
Since White Fang and 919 both were 3.73 trucks, I made the assumption 3.73 was always STD.

[pjmoreland]

Originally Posted by '68OrangeSunshine

Yes it does. OK. I get it. The Original Buyer _opted_ for 3.73 in his differentials.
Since White Fang and 919 both were 3.73 trucks, I made the assumption 3.73 was always STD.

That makes sense.

The funky shims in my rear diff, and new bearings in the front diff point to a gear swap.