Ok, my trans will downshif shift perfect under light throttle (and its of course hard under WOT and close to WOT), but in between where it gets close to boost or 1-3 lbs of boost the car just RAMS into gear when it downshifts, like makes my dash make noise and it feels sickening, like its gonna break something, is that normal like these cars are suppose to be like that, since the almost to no vacuum under partial throttle does it trick the trans into thinkin its at WOT?? This wont hurt my trans any will it, cause i like to go close to 1/2 throttle occasionally when im just drivin along just to pick up speed and it slams into gear as hard as if i went WOT

did you already try to adjust the TV cable? you use a screwdriver and push on the black square enough so the housing can be slid out until its tight. the little teeth on the end of the housing should be visible IIRC.

I did a little digging around, and Im gonna replace the Check valve that commonly leaks off the trans modulator, and see if that works, if not, the TV cable might be somthing too look into

Replaced it shifts quick and smooth, not slamming, so id reccomend replacing it, it was freakin 8.50 at the Dealer though

Coulda gotten a generic "HELP" branded one from any autoparts store for a few bucks. But at least that fixed it.

oh god damnit, there like 2$ at Napa

Is $6.50 really that big of a deal? :shock:  :wink:

lol nothing to take it back over, its genuine GM  :lol:

I say TV cable, mine did that same thing for the longest time, they were HARD, adjusted it, now its much smoother.....I have it set so it shifts a little high under light throttle but my bottom end sucks so I keep it....

It is kind of a pain to get to, I hope your left hand it strong.  I reach down and push it in with that and retract it with the right hand, then us the TB to open it back up...if that makes sense?

Quote from: z284pwrI have it set so it shifts a little high under light throttle but my bottom end sucks so I keep it....

What is hurting your bottom end?

Quote from: TookyCat

Quote from: z284pwrI have it set so it shifts a little high under light throttle but my bottom end sucks so I keep it....

What is hurting your bottom end?

My engine/camshaft combination.

An 1800 stall converter or whatever it is matched to an engine that doesn't make decent power till 2500 or so bottom end sucks.  WOT from idle is even WORSE than 1/2 or 1/4 from idle.  The 60 foot time would be so ugly.

Its even obvious in park/neutral when reving it.  Its way slow, then picks up really fast.  So I keep it set to where it will stay around 2500 or so under partial throttle instead of shifting to sub 2000 where its just a turb and ends up down shifiting anyways.

Quote from: z284pwrMy engine/camshaft combination.

An 1800 stall converter or whatever it is matched to an engine that doesn't make decent power till 2500 or so bottom end sucks.  

What cam do you have?

Funny you mention the stall.  I swear the converter on my TGP is one of the loosest I've noticed for a stock vehicle.  It's not as loose as say an aftermarket 3000 stall in a V8, but it is loose enough to notice.  When I had the tranny rebuilt, they matched up the stock converter to the remanufactured one, and on his chart it sounded like the same converter as a bunch of other Grand Prixs (non-turbo); I double-checked with him when I heard that because I thought the TGP had a special converter.  But believe it or not, this replacement converter does in fact perform identical to the original!  So I don't really have an explanation for that.

Quote from: TookyCat

Quote from: z284pwrMy engine/camshaft combination.

An 1800 stall converter or whatever it is matched to an engine that doesn't make decent power till 2500 or so bottom end sucks.  

What cam do you have?

Funny you mention the stall.  I swear the converter on my TGP is one of the loosest I've noticed for a stock vehicle.  It's not as loose as say an aftermarket 3000 stall in a V8, but it is loose enough to notice.  When I had the tranny rebuilt, they matched up the stock converter to the remanufactured one, and on his chart it sounded like the same converter as a bunch of other Grand Prixs (non-turbo); I double-checked with him when I heard that because I thought the TGP had a special converter.  But believe it or not, this replacement converter does in fact perform identical to the original!  So I don't really have an explanation for that.

Here....take a look at this, you might be suprised... :wink:

QuoteGM FWD Torque Converters

GM uses the same type 4-digit ID method of identifying FWD torque converters as with the RWD units, however the digits have different meanings.  All 125-C, 440-T4, 4T60, and 4T60-E transmissions use the same style torque converter, and they are interchangeable before 1996.  1996-up converters are built to be compatible with GM's PWM TCC apply strategy which means that you can use the newer converter on the older trans, but not the older converter on the newer trans.

1st Digit (application trans)

F -- 125C, 440-T4, 4T60, 4T60-E
2nd Digit (approx stall (depends on engine)

A -- 2795 rpm
B -- 2560 rpm
C -- 2385 rpm
D -- 2095 rpm
E -- 1865 rpm
G -- 1630 rpm
H -- 1515 rpm
J -- 2060 rpm
K -- 2760 rpm
L -- 1895 rpm
M -- 1525 rpm
Y -- 1420 rpm
Z -- 2375 rpm
3rd Digit (TCC clutch material)

0 -- Clutch omitted by factory
5 -- Clutch contains poppet valves
All other digits (pre 1996):

Red Fiber material
1996-97

C, E, H, K, P -- Carbon filled clutch
1998-up

F, H, K, Q -- Woven graphite clutch
4th Digit (Clutch Type)

B -- standard
C -- viscous (stay away from these type)

Unless the converter isn't original *the trans was rebuilt like in 1998 by a shop the previous owner took it too*

If we go with our plans, we will be rebuilding a 4T60-HD and putting in an FKxx converter *2760 stall*

Oh and the cam, its a custom grind cam from Crower, specs here
http://home.earthlink.net/~z284pwr/beretta/engine_stuff/cam_small.jpg

The bottom end sucks, it even sucked behind a 3.1 N/A 5spd with a Fidanza flywheel and a Haltech EMS, however, top end is excellent.  Unlike stock that dies at what 5200 or so, it pulls to 6500 no problem, the turbo/transmission don't like it though :lol:

oh damn its still sorta doing the slaming thing, not AS bad but it still jolts into gear, I didnt really understand how to adjust the cable, like, do they auto adjust or somthing? cause i dont wanna over adjust it or somthing

Quote from: Prospeederoh damn its still sorta doing the slaming thing, not AS bad but it still jolts into gear, I didnt really understand how to adjust the cable, like, do they auto adjust or somthing? cause i dont wanna over adjust it or somthing

Its really simple actually once you figure out the how it works and over adjusting it isn't really possible as the TB only opens so far... :wink:

If you would like, I can snap up some pictures later of what to do for ya