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#1 |
Registered User
Join Date: Sep 2007
Location: Alexandria, Louisiana
Posts: 61
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Hydraulic clutch in 73 pickup?...what are the options?
What are the options for putting a hydraulic clutch in a 73-80 pickup?...
Is there any option to avoid hacking on the firewall to put a master cylinder there? |
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#2 |
Registered User
Join Date: Dec 2007
Location: Kimberley, BC, Canada
Posts: 799
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Re: Hydraulic clutch in 73 pickup?...what are the options?
Hi slammed. I have a 77 truck that I retrofitted a hydraulic clutch into. It turned out to be fairly easy, but did involve some fabrication. I used the clutch cylinders from a 93 chevy truck (what I happened to find at the yard). But I'm going to replace those with the 91 cylinders that I used on my Suburban, because they were easier to connect hydraulic lines to.
I didn't hack up my firewall, I just drilled a 1" or so hole in it. I could take some pictures if you really want to see how it was done.
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Greg 64 GMC Suburban - 283, NV3500, 14 bolt 77 C10 swb - 292, SM465, 12 bolt |
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#3 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Hydraulic clutch in 73 pickup?...what are the options?
I have an 87 or 88 R30 pedal set, clutch master, and Hydroboost in my 1976 to fit the NV4500 and 6.5L diesel.
I agree you don't have to hack up the firewall. The holes are not large and even the master cylinder would be hidden at least partly by a Vacuum booster can. I added small 16ga sheet metal plates barely larger than the clutch master flange on the inside and outside of the firewall. I put those plates on to add support to the firewall sheet metal. I probably could've used the clutch master from the 1998 T400 K30 transmission donor. If you're worried, and the donor cab is spent, you may be able to get a section of the later model firewall. Or. Tape a sheet of heavy paper over the brake master and clutch master holes and mark the hole locations from inside the cab... The 85-86 CK or 87-91 RV trucks have hydraulic clutches stock. Make sure to get the pedals from the correct flavor of brake assist Vacuum or Hydroboost. Be sure to get the booster pushrod as well. The pushrod pins are in different locations on the pedals depending on booster and brake options. I cheated a bit and got the pedals, brake booster, pushrod, and clutch master from one R30 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. Last edited by hatzie; 02-20-2015 at 06:47 PM. |
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