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#1 |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Hydraulic vs. Mechanical clutch -- when did the change happen?
The debate keeps surfacing on Facebook from time to time. Was there a specific model year change in the clutch pedal design? Was it a running change that happened in the middle of a model year? Did some factories change before other factories did?
Hopefully Keith Seymour or someone else with factory experience can chime in here.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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#2 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,518
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
1985
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#3 |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
Some folks say they've seen hydraulic clutches as early as 1984 model year. Other folks declare up and down that their 1985 truck came with a mechanical clutch from the factory. Was there possibly some variation in the assembly plants?
__________________
1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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#4 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,518
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
Possibly, from left over orders or inventory
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#5 |
Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,204
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
How many different manual transmission where offered? Weight rating of the truck may also play into year difference disputes.
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#6 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
Only 1 that I know of which was the SM465
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#7 |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
There were a couple others. There was a 833 transmission with four speeds, overdrive, a floor shifter, and was a side loader.
There was also at least one side-loader three-speed that was column shifted. I've never learned for sure if there was a second three-speed available or not.
__________________
1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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#8 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,518
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
3 on the tree in 85?? never seen one of those
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#9 |
Moderator
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Location: Wentworth, NH
Posts: 4,950
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
I believe it was 1985. My 1985 C10 came with a hydraulic setup and I had a 1984 with the old Z-bar setup.
Can't forget what a pain in the neck it was to bleed the hydraulic clutch on that truck.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#10 |
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
I have an 83 crew with 4 speed that is mechanical and an 85 C20 and 85 C30 that are both hydraulic SM 465 setups. So after 83 and for sure by 85 but cant speak to 84. Only one of those Ive owned an auto.
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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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#11 |
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Location: Beebe, AR
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
I have an 84, its a Z-bar like Hatzie mentioned.
Also have an 85 and 86, they are both hyd with the sm465 transmissions. Bubba |
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#12 |
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Location: Colorado
Posts: 1,074
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Re: Hydraulic vs. Mechanical clutch -- when did the change happen?
I agree with the consensus. I got this out of a 1984 Blazer a few weeks ago. I do wish it had been an 85.
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James |
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