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#1 |
Registered User
Join Date: Jan 2015
Location: Denver, CO
Posts: 26
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trans grind into reverse
any ideas why my manual transmission on my 72 gmc is grinding when going into reverse
fluid levels? clutch? operator error (I haven't had this problem before)? thanks -Michael |
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#2 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: trans grind into reverse
if i dont push my clutch into the floor panel, my reverse will grind too
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1967custom |
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#3 |
Registered User
Join Date: Sep 2014
Location: Gloucester Massachusetts
Posts: 72
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Re: trans grind into reverse
My transmission does the same thing. My clutch is also in adjustment, so I've found to just double clutch into reverse and it does not grind. I know probably not the best solution but the time being thats what works for me.
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#4 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: trans grind into reverse
There's a shift pattern that helps too, but it's been so long since I had my 3 speed.
Maybe 1st, then R? Meaning with the clutch in, shift to 1st first, then into R and it helps.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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#5 |
Registered User
Join Date: Jan 2015
Location: Denver, CO
Posts: 26
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Re: trans grind into reverse
thanks, I never considered that
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#6 |
Registered User
![]() Join Date: Oct 2010
Location: Tucker, GA
Posts: 128
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Re: trans grind into reverse
I shift mine into second and then reverse, stopped the grinding
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"You gonna pull them pistols or whistle dixie ?" |
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#7 |
Registered User
Join Date: Sep 2014
Location: Gloucester Massachusetts
Posts: 72
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Re: trans grind into reverse
Yes that is what I meant to say too. Do not know why I said I double clutch. I do in fact go into first then up to reverse in on motion which eliminates any grinding. I was told by someone along the line that this was due to a non synchronized reverse gear, but whether or not that is the cause someone else would have to confirm.
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#8 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: trans grind into reverse
I drove with my 3 spd for about 6 years before I put a 700R in, around 2002? So, I'm a little fuzzy on the shift combo!
![]() Try 'em all and see if any work for you.
__________________
Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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#9 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: trans grind into reverse
Reverse is not synchronized in these old transmissions.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#10 |
Registered User
Join Date: May 2015
Location: Edmonton,Alberta, Canada
Posts: 103
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Re: trans grind into reverse
I find I just need to hold the clutch in for a few seconds before I shove it in reverse and no grinding.
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#11 |
Registered User
Join Date: Apr 2011
Location: formerly NY currentlyNC
Posts: 390
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Re: trans grind into reverse
the clutch is not disengaging completely and allowing the input shaft to spin...a syncronized gear is much more forgiving to this condition...the clutch might need to be adjusted,there could be oil or grease on the disc causing it to stick to the flywheel and/or pressure plate,a bad pressure plate not releasing evenly,a disc with a piece of friction material hanging off and dragging, or a worn or dry input shaft bushing in the back of the crankshaft could all cause this...sticking it in a syncro gear to get it to stop spinning then quick stuffing it into reverse will make it driveable but you're not doing your tranny any favors
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1970 short step c10 leaf spring 454 |
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