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#1 |
Registered User
Join Date: Sep 2004
Location: Bushkill,PA
Posts: 38
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700r4 question.
When in drive and I slow down to stop the downshift to first gear is kind of hard,when in overdrive and i slow to stop you can hardly feel the down shift.Why does it do this? is this normal?
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85 K5 Blazer |
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#2 |
In Progress
Join Date: Feb 2005
Location: Kamloops, BC, Canada
Posts: 312
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i get the same thing with my th350, jerks relly hard goin into 1st
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1993 Chevrolet K2500 454 4L80E 1974 GMC 1/2t 2wd Stepside 305 auto *sold* 1985 Ford Mustang GT 5.0 5spd |
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#3 |
Registered User
Join Date: Jan 2005
Location: Strathmore, CA
Posts: 110
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I've noticed the exact same thing on my 700r4. I hope it doesn't mean my trans is going to go out on me.
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'77 Blazer 2wd lowered 5/6 Goodwrench 350/700r4/3.73 Performer intake Performer 1400 carb Sanderson Headers/Dual 2 1/2" Flowmasters |
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#4 |
Mudslides 'r my specialty
Join Date: Dec 2003
Location: STL
Posts: 1,106
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I've got it too.
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Always on the lookout for old cars and parts...(20s, 30s, 40s, 50s, 60s, etc.) http://www.cardomain.com/memberpage/500339 |
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#5 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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haven't noticed it yet in the 700R4 in the camaro, but the TH400 in the dually has a hard upshift to third and mildly hard downshift to 1st.
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#6 |
Shadetree Mechanic
Join Date: Oct 2002
Location: Youngsville, NC
Posts: 100
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Normal
My 700R4 has operated this way since it was new.
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Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok |
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#7 |
Registered User
Join Date: Oct 2003
Location: CT
Posts: 315
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I think the hard downshift is because in drive you're tranny will act like an engine brake. For example, if you're going down a hill with you're foot off the brake it should feel like theres something holding the truck back from coasting. As soon as you put it in OD it will take off and coast, because the tranny is no longer "braking".
I'm sure this is normal, i think this is mentioned in the Owners(engine braking when in D vs. OD) BTW, mine tranny does the same thing(700R4)
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Anthony 07 Tahoe LT 70 Chevelle 450HP 383-TH400 77 GMC Royal Sierra~Resto in progress~ |
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#8 |
Registered User
Join Date: Feb 2003
Location: Bertrand, Nebraska
Posts: 355
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How fast are you going when you feel this downshift happen. They all do it when in d3 and downshift to 2nd when coming to a stop, maybe that's what you're feeling instead.
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98 Neon 97 Grand Prix GT 02 Grand Prix 40th Anniv. 86 GMC 5.0 77 Olds 98 6.6 REAL AMERICANS, DRIVE AMERICAN |
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#9 | |
Registered User
Join Date: Sep 2004
Location: Bushkill,PA
Posts: 38
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Quote:
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85 K5 Blazer |
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#10 |
california fill
Join Date: Apr 2004
Location: Sunny So-Cal
Posts: 694
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if you have the shifter in any of the lower gears, it does something to the line pressures.. my th350's have always done this and im pretty sure my 700 does it too.. Its normal.. im not 100% sure of how or why it does it, but its normal
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#11 |
North Coast, baby!
Join Date: Jun 2004
Location: Toledo, OH
Posts: 437
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I don't know that I'd call it normal. My TH350 never did it until I developed a vacuum leak that still remains unfound. I replaced the vacuum line from the trans line to the manifold (small piece of hose about 1" long in front of distributer) and this helped some. Whatever is causing my engine to idle higher than normal is the root of the problem for my downshifting. I am leaning toward a faulty EGR block off but until I get around to getting another gasket for it I won't know for sure.
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Brad 79 Scottsdale C20 ![]() 350/350 3.73's Still running full CA smog gear! ![]() |
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#12 |
Getcha' Pull!!!
Join Date: Jun 2004
Location: Jim Thorpe, Pennsylvania
Posts: 215
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ry greasing the splines on your transfer case's output shaft. i had the same thing happen downshifting from 2nd to first and also from first to second as well. Anyway I greased em up and slapped the d/s back in and it quieted it down a bit. Of course this isn't a permanent fix; but it should help a little bit.
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#13 |
LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,088
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My old TH700 did that in drive. It is how they are.
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Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 |
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#14 |
Getcha' Pull!!!
Join Date: Jun 2004
Location: Jim Thorpe, Pennsylvania
Posts: 215
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I also hear that GM has a "special" yoke that they sell that helps this. Turns out it is plated with somethng (nickel)?. It's cost is 125.00; but I'm not gonna go there......
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#15 | |
Registered User
Join Date: Sep 2004
Location: Bushkill,PA
Posts: 38
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Quote:
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85 K5 Blazer |
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#16 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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I've got a shift kit (transgo) in my th400 and I cant even feel it down shift coming to a stop. Its very unnoticeable you can hear the rpms go up just a tad but other than that its really hard to notice.
Brad, have you checked to see if the transmission filter has more than one O-ring? I forget how the th350s are setup but on a th400 sometimes the old O-ring stays in the bore. When the other one gets installed there will be 2 O-rings now and it will cause a lot problems. Might want to check that out if nothing else works.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI Last edited by MylilBowTie; 03-11-2005 at 08:47 PM. |
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#17 |
Registered User
Join Date: Nov 2000
Location: Victoria, Texas
Posts: 71
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Same here. My TH350 feels as though it is being manually downshifted into first gear, without benefit of a clutch. Severe clunk felt at 10 mph or less, on approaching a stop. No harm done so far, with 60K miles on it.
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