700r4 shifting and 2nd gear . - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-19-2004, 06:39 AM
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700r4 shifting and 2nd gear .

Hi,
Ive got a th700r4 in a 350 chevy powered range rover kit car. This is a new install using an personally unkown box (told it was good). It previosly had a th350 in it. I fitted a b&m transpac in "4x4" mode for good measure before fitting the box.

Its been quite difficult to be able to pin down a description of the problems because this is a new box to me, so its difficult to be able to tell what it should feel like.
The shift points out of 1st and kickdown were all wrong - so straight away i double checked and played around with the TV cable. I fabricated my lever following the guidlines - 1.1" front centre line etc. Make sure the WOT=FULL PULL on tv. I even put a pressure guage on it to check the pressure at closed throttle etc.

Here's the Facts:
Putting it in manual 2nd doesnt produce any engine braking effect (1st does)
Pulling away from standstill in manual 2nd, it never feels like it changes from 1st into 2nd (revs seem the same, no engine braking effect).
Pulling away in "drive" you can feel it do a part throttle change,to what i assume is 2nd (not totally convinced - is this 'slipping'?).
Pulling away from a standstill in any gear, it never does a WOT change out of 1st unless you back-off the throttle.
Out on the road i can feel it go into overdrive, confirmed by shifting back to 3rd gives a 500rpm increase in revs. A 3 mile drive resulted in high oil temps(240f) - so its definatley not happy.

Ive taken the pressure readings following the chart in the B&M notes,figures in brackes is the range allowed according to notes. (ive padded this out to try to keep formatting)

Range (@1000rpm)__Min TV____________FullTV
P,N,OD,3__________82psi(75-85)_______190 (166-203)
R________________130(100-140)_______250(180-340)
1,2______________150(160-245)_______150(160-295)

What sticks out to me, is that manual 1 & 2 shows the same pressure regardless of TV pull.

Sorry for the long post, but ive tried to include as much into as possible.

Thanks,
Eliot.

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Old 06-19-2004, 06:57 AM
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Cool

Sounds like the band is the problem. It could be a bad band , bad accumilator, leaking sealing rings on the servo for the band. Mis assembly of the tranny parts perhaps. Sticky shift valve in the valve body

Same band applies 2nd gear as it does in 4th.

Your pressures look good. The same pressure reading in 1 & 2 is simply the boost circuit over-riding the TV . THis is the way the 700 is designed to function
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Old 06-19-2004, 07:01 AM
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So it wants pulling and rebuilding then?
Thats what i was going to do, just wanted to make sure nothing silly before pulling it out (again!)

Thanks for quick reply.

Eliot.
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Old 06-19-2004, 06:25 PM
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try the following website for tons of info on your tranny.
www.700r4.com
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Old 06-20-2004, 03:09 AM
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Thanks,
Ive been on that site, very good.
I pulled the tranny out yesterday - i'm going to get it rebuilt and upgraded at the same time.

Cheers,
Eliot.
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