Re: Starting to work on the Duster
[Re: mopar dave]
#2754931
03/23/20 10:28 AM
03/23/20 10:28 AM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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I ran the TA RMVB as well. I don’t recall the cold fluid shifting worse, but it very well could have.
But, for sure........ if you were at light throttle in 2nd, and let the vehicle speed stabilize for the engine rpm, and allow the converter to lock up....... the 2-3 shift would be pretty harsh and clunky.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Starting to work on the Duster
[Re: AndyF]
#2754966
03/23/20 11:25 AM
03/23/20 11:25 AM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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On that style of VB, since the throttle pressure is fixed(and high), the shift itself is basically the same under most conditions.
The difference in the shift feel is that when the converter isn’t locked up, the clunky shift feel is just absorbed in the converter slip.
The tighter the converter is, the smaller the window is to find a sweet spot to get the shifts in before the converter starts to lock up.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Starting to work on the Duster
[Re: AndyF]
#2754968
03/23/20 11:28 AM
03/23/20 11:28 AM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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"Positively not for street use" used to come stamped all over the box for the Cheetah RMVB lol. Mine clunks at light throttle slow speeds, but with a 4800 converter once your actually accelerating the tach doesn't even move on the shifts anymore.
68 Barracuda Formula S 340
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Re: Starting to work on the Duster
[Re: als499]
#2755417
03/24/20 12:14 PM
03/24/20 12:14 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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Wow!!! There’s a lot going on with that car!!
I like it.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Starting to work on the Duster
[Re: AndyF]
#2761916
04/09/20 01:29 PM
04/09/20 01:29 PM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
super stock
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super stock
Joined: Jun 2019
Posts: 744
Almost Heaven
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He also said that I shouldn't down shift into first gear unless I'm stopped or moving very slowly. I told him I had downshifted to first for a traffic light but then got back into it when the light turned green. He said if you down shift into first at too high of a speed and then hit the gas hard you can break the sprag. They have had people do that when they use the race valve body on a street car. He builds a pro street valve body that prevents the problem but I don't really want to change valve bodies right now. I don't really need to down shift to first when the car is moving anyway so I just need to stop doing it. I thought if anyone knew this it would be you. You need a LBA valve body. I bought one to replace the Cheetah in my car if it ever gets back on the road, or to go with it if I ever send it down the road. I really dig that Duster.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Starting to work on the Duster
[Re: AndyF]
#2762186
04/10/20 09:19 AM
04/10/20 09:19 AM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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I have driven so long with my old cheetah valve body I am afraid to go LBA. I am bad about dropping it into first as I slow down and just rolling up to the stoplight or whatever. If I ever swap to a low band apply I will probably eat steering wheel a few times until i get retrained.
68 Barracuda Formula S 340
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Re: Starting to work on the Duster
[Re: Bad340fish]
#2762279
04/10/20 12:23 PM
04/10/20 12:23 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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The thing to keep me in mind is...... with a stock valve body and the shift selector in “drive”, low band apply doesn’t happen. So, from a stop, the rmvb being shifted 1-2-3 is operating the trans in the same sequence as the stock vb does.
One of my customers had the shift points set where he wanted them with the shifter in “drive”, and raced the car like that for years. High 11’s in a 3950lb car....... no lba while racing in “D”....... never an issue.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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