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Old 01-15-2003, 08:33 AM   #1
Zlayd
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Better than a shift kit?!

My friend's dad owns a transmission shop, so I asked him how much to install a shift kit. Well, he proceeded to tell me that their is a better way to "bark the tires." According to my friend, his dad has been doing for years on imports and domestics. Apparently, all you do is remore a cable, which allows the transmission to shift harder and chirp the wheels at full throtle. After a little research I found a site (http://www.eng-tips.com/gviewthread...pid/108/qid/858) According to the post it said it's an old "Hot Rod Shift Kit Trick." For all those mechanics and auto experts, do you know of any consequences (pros and cons)? Also, he mentioned that the only thing to be weary of is the driveshaft, as it may be put under too much strain with racing.
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Old 01-15-2003, 08:53 AM   #2
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Considering our transmissions are electronically controlled, I don't think you can just yank a cable... The only two ways I know to bump up the line pressure are a B&M shift kit and an autotrans interceptor
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Old 01-15-2003, 10:41 AM   #3
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Here's a better link http://www.eng-tips.com/gpviewthread...lev2/6/lev3/35
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Old 01-15-2003, 10:43 AM   #4
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Quote:
Originally posted by iceman
Considering our transmissions are electronically controlled, I don't think you can just yank a cable... The only two ways I know to bump up the line pressure are a B&M shift kit and an autotrans interceptor

I thought so too, but according to the site there is something called an "accummulator spring". Can this spring really make a difference?
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Old 01-15-2003, 11:50 AM   #5
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An accumulator is a fluid "shock absorber" By increasing the spring pressure, you are forcing more fluid shift pressure to the plates and less to the accumulator, thus creating a harder shift. Most shift kits include accumulator spring kits. BUT ... if you do increase the accumulator spring rate, you should also increase the line pressure equivalently. For every action there is an equal and opposite reaction ... and the closer you stick to this in an automatic, the safer you are. This is also better for the transmission (to an extent) because it limits the amount of slippage on the clutch packs so they last longer. But you do reach a point at where parts "slap" together and cause fatigue. That is why you should always increase line pressure to match the accumulator spring rate.
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Old 01-15-2003, 12:34 PM   #6
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So Craig, increasing line pressure without adjusting the accumulator volume is a mistake relative to durability?

Seems logical from your statements...

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Old 01-15-2003, 01:43 PM   #7
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It isn't *recommended*. What you are doing is increasing hydraulic force, but not having appropriate shock absorbtion. What it will do will 1. apply too much pressure to the valve body, and 2. prematurely wear the springs. Just think of it in the same terms of a suspension system ...

Obviously, it isn't going to cause an immediate failure ... but long-term could be a problem.
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Old 01-15-2003, 01:45 PM   #8
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FYI - If anyone wants some basics on auto transmissions, check this out:

http://www.howstuffworks.com/automatic-transmission.htm
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Old 01-15-2003, 07:38 PM   #9
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So basically this is not such a wise thing to do. or is it?
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Old 01-16-2003, 07:31 AM   #10
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Well, I would NOT yank the cable! I wouldn't just add an accumulator spring either!

I would increase the line pressure but with an ASE chip NOT the AutoTrans Interceptor. The ASE is "calibrated" for our cars. The AT is a "generic" unit just like the B&M one that people used and had problems with.

The ultimate solution is to increase the line pressure, then when someone comes out with a "shift kit", install that as well.

When I rebuilt my 700R4 on my Jeep, I notice the control plate in the valve body was almost wore through! The guy had placed a double spring in the accumulator to increase shift pressure! This extra pressure without higher fluid pressure to back it up started tearing through the thin metal sheet. I fixed it with a single spring from a Police Interceptor and added a "repair sheet" over the plate in that area.

Anyhew ... that would be my opinion based on my experience ...
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Old 07-27-2007, 09:47 AM   #11
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Where can I buy a B&M shift kit for a Grand Am GT?
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Old 07-27-2007, 02:37 PM   #12
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Do a search, it's not difficult. Good job bringing back from the dead a 4.5 year old thread.
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Old 07-27-2007, 03:44 PM   #13
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Quote:
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Do a search, it's not difficult. Good job bringing back from the dead a 4.5 year old thread.
I think the "Search" is what brought back the thread
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Old 07-27-2007, 05:35 PM   #14
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Where can I buy a B&M shift kit for a Grand Am GT?


You can't. No one makes one and you don't need one. Check out several of the other threads in this section on strengthening the transmission if you feel you really need it.
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Old 12-28-2013, 06:25 PM   #15
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well im gonna bring it back now,,,.
just bought a 2000 se with 2.4 in it.
its waiting to long to shift as in while
holding at present throttle it takes 3 or
4 seconds to shift and with a good bump
when it finaly does.
changed the filter and fluid allready,didnt
help.

any help much appreciated.
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Old 12-28-2013, 06:27 PM   #16
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Torque converter
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Old 12-28-2013, 07:26 PM   #17
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F40 trans swap.
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Old 12-28-2013, 08:09 PM   #18
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i agree!
if only some one had a more cost effective alternative for this swap, like the option of a used trans instead of a brand new one (which is cool dont get me wrong but there has to be a few used ones floating around out there), these 4t45e's dont seem to take much to break.
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Old 12-28-2013, 08:25 PM   #19
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Yes F40 6 speed honestly when it comes to a transmission swap... I would like new.
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Old 12-28-2013, 08:35 PM   #20
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just hard for me to justify spending $4k+ on it personally, but sometimes i can be cheap like that, maybe if cash flow was higher and i could tie the car up for a while it would be a different story. but i do know where there is a 04 se with a five speed thats in the same town as me..
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