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04-04-2011, 10:34 AM
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#1 |
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Registered User
Join Date: Mar 2011
Location: Gallatin, TN
Posts: 6
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Intro and Question Trans Hard shift?
Hi All
My name is Rob Mannon, and I am new to this board. I live just outside nashville Tn, and have been a motorhead from birth. I purchased a my first square this weekend, and am stoked about the resto. I do have one concern that is over my head. I have an 87 SWB 350/700r. When I put it into gear (f or r ) it SLAMS, and when shifting from 1-2 it is pretty hard but bearable. My main concern is the when I put it in gear. Any thoughts? BTW I have joined forums before for my other rides and this one has more info and pictures than any of the others. Kuddos to the moderators Last edited by BigRob; 04-04-2011 at 11:06 AM. Reason: Forgot to introduce myself |
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04-04-2011, 02:43 PM
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#2 |
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Registered User
Join Date: May 2007
Location: The Netherlands
Posts: 185
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Re: Trans Hard shift?
Got the same problem with my '86.
It's worse putting it in Drive Haven't had the time to take it to a trans specialist yet...... U-joints, engine & transmounts are new..
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1972 GMC 2500 Sierra 350 1971 Pontiac LeMans Sport 400 GTO/Judge Clone 1970 Pontiac GTO 400 convertible restoproject 1970 Pontiac Bonneville 455 convertible |
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04-04-2011, 03:11 PM
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#3 |
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1962 C-10
Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
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Re: Trans Hard shift?
Hello Rob. Welcome to the boards.
My brother in law had the same problem with a 700r4 after a rebuild. The problem was a sticky governor. Luckily in his case, it fixed itself after driving it bit. I'm sure some transmission gurus will chime in with some good advice for you.
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Joseph Chavez  "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4 |
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04-04-2011, 03:37 PM
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#4 |
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Registered User
Join Date: May 2009
Location: osceola, iowa
Posts: 155
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Re: Trans Hard shift?
My 305/700r4 does the same thing, almost like theres a shift kit or something, but i know there isnt. im going to check mounts and everything this weekend.
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1987 V10. 305, Th-700R4, (dail driver at home, work in progress) my baby 1967 C25. 250 inline 6, muncie 4 speed, dana 60 (project truck work in progress) 2010 Colorado. Inline 5 (mom's truck) 2004 1/2 ton. 5.3 Vortec (dad's truck) 1995 oldsmobile cutlass supreme. 3.1 v6 (daily driver at college) |
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04-04-2011, 03:38 PM
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#5 |
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GoatLube Experss
 
Join Date: Oct 2009
Location: clarksville, Tn.
Posts: 1,337
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Re: Trans Hard shift?
welcome abaord ! I live in Clarksville when I'm on the side of the planet.
a few question's: does the truck seem to idle high ? are the Ujoints in good shape ? have some one hold the brake with the truck off and in nutral, see if there is any slack in the Ujoints.
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Goat Lube Express, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's) Last edited by jitteryguy; 04-04-2011 at 03:39 PM. |
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04-04-2011, 08:10 PM
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#6 |
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Registered User
Join Date: Mar 2011
Location: Gallatin, TN
Posts: 6
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Re: Trans Hard shift?
It does seem to idle high, but the 1-2 shift put me off of that trail. I guess there could be two issues in one. What would cause it to idle high vacuum leak? Tps? It has been so long since I have had fuel injection that I can't remember the quirks.
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04-04-2011, 11:58 PM
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#7 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Trans Hard shift?
Your RPMs are too high. Check the timing. Reset it to zero. You can add a few degrees for performance. Check for engine codes. You'll find great TBI info here http://www.cfm-tech.com/GM_tbi_tuning_tips.htm
Welcome to the board. |
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