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05-01-2014, 11:52 PM
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#1 |
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Roadtrip!
 
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,790
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Rear gears 3/4 ton
Just picked up a 3/4 ton 71 gmc burb with a 307 and a powerglide trans. Anyone know if the rear end would be a 4:10 as standard with that combo? Nothing listed in the glovebox other than no-spin.
Thanks for any help.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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05-01-2014, 11:55 PM
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#2 |
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Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: Rear gears 3/4 ton
Jack up one tire and count driveline rotations per wheel rotation. That will get you close. Otherwise, look for a tag on a cover bolt or remove the cover, count the teeth and do the math.
Jeff
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I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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05-02-2014, 12:56 AM
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#3 |
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Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,975
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Re: Rear gears 3/4 ton
standard for 3/4 t with small block = 4.10
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05-02-2014, 03:18 AM
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#4 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Rear gears 3/4 ton
On a 71 Chevy Suburban C20 with 307/M35 it would be a 4.57 axle ratio as standard. Gee $32 more and they could have had a TH350, too bad.
The same ratio was used in 71 Chevy C20 pickups as well with the 307/M35, 4.57 or 4.56 with leaf springs (dana axle).
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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05-02-2014, 08:43 AM
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#5 |
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Roadtrip!
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,790
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Re: Rear gears 3/4 ton
Thanks tim, i kind of thought with the powerglide it may have a different standard ratio. I will get a pic of the spid for you also. I think it has paint listed 3 times...
Eric
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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