Used Gear Backlash Changes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71meangreenc10 · 01-30-2018, 10:57 PM

Need some thoughts on this issue.

Pulled the rear end for Sloppy Jo and the old gears BL was at 15 thousands (checked multiple spots on the ring). They are original and show no bad wear on the teeth.

Should I replace them with new gears to get the BL in spec 6-10 thousands or will there issues using the used gears and resetting the BL?

Thoughts????

Smitty

**kwmech** · 01-31-2018, 01:44 AM

Tightening up the used gear set to a tighter backlash will change the pattern slightly, and also could make them noisy. If the gears look good, I would just change all the bearings and put it back together the way it is

71meangreenc10 · 01-31-2018, 02:29 AM

Quote:

Originally Posted by kwmech

Tightening up the used gear set to a tighter backlash will change the pattern slightly, and also could make them noisy. If the gears look good, I would just change all the bearings and put it back together the way it is

Thank you. The carrier bearings and races looked very clean and no spots on them...Might replace everything and call it a day...

Smitty

Mike C · 02-04-2018, 09:31 PM

I'd get a new shim set and tighten the BL to .010 if it were mine.

01-30-2018, 10:57 PM	#1
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Used Gear Backlash Changes Need some thoughts on this issue. Pulled the rear end for Sloppy Jo and the old gears BL was at 15 thousands (checked multiple spots on the ring). They are original and show no bad wear on the teeth. Should I replace them with new gears to get the BL in spec 6-10 thousands or will there issues using the used gears and resetting the BL? Thoughts???? Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

01-31-2018, 01:44 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,382	Re: Used Gear Backlash Changes Tightening up the used gear set to a tighter backlash will change the pattern slightly, and also could make them noisy. If the gears look good, I would just change all the bearings and put it back together the way it is

02-04-2018, 09:31 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,709	Re: Used Gear Backlash Changes I'd get a new shim set and tighten the BL to .010 if it were mine. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

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