350 turbo soft shifting/ fluid type

6831 Views 10 Replies 4 Participants Last post by stanjr41, Jun 17, 2009

stanjr41

Discussion Starter · Jun 10, 2009

I just installed a B&M 3000 stall 10" converter; changing from a 2000 stall 12"converter. B&M instructions say to use either B&M trick shift or type F trans fluid. Now it seems like the trans doesn't shift as hard as it used to.Previously, when it shifted at part or full throttle, the shift was very hard,and would churp the tires with each shift and quick.Now it seems like it's slipping into gear.The car runs great; but it feels like it's slipping when accelerating also. Fluid level is ok. Is this just the reaction of the converter or the result of using different oil? What is the difference between type F, dextron II and B&M trick shift? Car is a 1965 Rambler wagon w/493 hp 383 4.10 posi rear and a shift kitted 350 turbo.

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Crosley

· #2 · Jun 11, 2009

stanjr41 said:
I just installed a B&M 3000 stall 10" converter; changing from a 2000 stall 12"converter. B&M instructions say to use either B&M trick shift or type F trans fluid. Now it seems like the trans doesn't shift as hard as it used to.Previously, when it shifted at part or full throttle, the shift was very hard,and would churp the tires with each shift and quick.Now it seems like it's slipping into gear.The car runs great; but it feels like it's slipping when accelerating also. Fluid level is ok. Is this just the reaction of the converter or the result of using different oil? What is the difference between type F, dextron II and B&M trick shift? Car is a 1965 Rambler wagon w/493 hp 383 4.10 posi rear and a shift kitted 350 turbo.

higher stall converter will soften the feel of the shift.

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stanjr41

Discussion Starter · #3 · Jun 14, 2009

350 turbo shifting softly

I have a car with a 383-500 hp engine. The rear end is a posi/with 4.10 gears. The trans is a rebuilt 350 w/shift kit. I initially had a 2000 stall and the trans shifted great, chirping the tires in all gears. I installed a 3000 converter to get into the power range of the engine. Now the shifts are almost unnoticeable. It seems to slip through the gears as if were a centrifugal clutch. I am afraid to get on it because it feels like a manual trans with the clutch 1/2 engaged. It feels like the are covered in oil. Before I went to the higher stall everything worked great except for a bog between 1500 and 2000 rpm.I assumed this would solve that problem. I had previously changed the filter and added an aluminum deeper pan.But that was 100 miles before this problem arose. While taking off moderately if the mufflers were quiet you wouldn't know that it is shifting. I am ready to go back to the 2000, unless someone can help me. It also does this while shifting it manually.

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barnym17

· #4 · Jun 14, 2009

what you are feeling is likley the fact that you get extra shock absorbtion from the higher stall convertor.That slipping clutch feeling is how it is supposed to work.Nail it once you will feel the difference.

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Crosley

· #5 · Jun 14, 2009

stanjr41;

you asked the same question twice with the same answer provided.

I merged the 2 threads together.

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stanjr41

Discussion Starter · #6 · Jun 14, 2009

350 turbo shifting softly

The two are similar but I still would like to know the diff. between type F and mercon/dextron trans. fluid. Thanks

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keesey1985

· #7 · Jun 14, 2009

type f has more friction modifiers in it to reduce bubbling and foaming. it is like the friction modifier in a rear axle for a limited slip. type f is supposed to get you firmer shifts but with a modified trans and a higher stall you will get a softer feel.

my truck which is broke now. i put a 3500 stall and my shift is quick almost a slight bump and about a 3-500 rpm drown and it keeps hauling along. it has to shift for me to be able to go 45 without it slowing down i cannot hold 2 gear and do 40, it just isn't spinning fast enough. i used a Fairbanks kit and programed the valve body for comp, as opposed to the street/strip version. the only problem i had is it wouldn't shift till near red line so i had to get into it.

just scooting around town it felt like it was slipping but it was just the stall kicking into neutral from what i was told. i could romp on it and away i went.

just make sure you have enough fluid in it, the trans shop by me said that with the kit i didn't need to run type f, dex would be fine and it also runs cooler supposivly.

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barnym17

· #8 · Jun 14, 2009

What it is is leaning on the convertor multiplying tourque as it does so many drag cars have stall speeds way up there just to do this on shifts as it makes the car quicker.Think of it as a constantly variable gear ratio up to lock up speed.

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stanjr41

Discussion Starter · #9 · Jun 15, 2009 (Edited)

350 soft shifting/fluid type

I tried both way of shifting.When I leave the shifter in drive, the tires don't hook up until well into third gear; it's crazy though- the car really wants to get sideways up to around 80-90 mph. I've got a posi, but the right tire leaves a huge mark as compared to the left.The shifts are barely noticeable. When I shift it manually; the shifts are positive, but nowhere near as crisp as with the 2000 stall. Around town, if I leave the car in drive and accelerate to 40 mph,. it seem like the tach will show 2500, but if I back off to around 1800 the car will maintain the same speed. Is that the converter doing its thing? I put the car back on jacks, and I am thinking of having my son put the 2000 back in.Anyone have an opinion yes or no? 90% of my driving is stop and go at around 40 mph in town. Is that 10% that I love so much worth it? I know it's a personal thing. If I leave it in,will this create more heat than my cooler can handle?

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