4+3 Transmission problems

[Mike]

My 1988 with the 4+3 transmission won't shift in to High gear. The indicator on the dash says the O/D is on but it isn't. The fluid is full.

[Darrin]

I have had variuos problems with mine. Usualy changing the overdrive filter helps. The 4+3 uses several different sensors to make the shift work and if one of those are out it could cause the problem. I have heard the best thing to do with the 4+3 is to bypass it so you can control when it shifts not the sensors.

[Mike Dill]

My trans will let the engine rev up slightly when shifting from 3rd to 4th gear. got 108 thousand miles on the truck. A 2000 GMC sierra. Do you think there could be a simple fix? Mike Dill

[ryan]

Darrin wrote:

I have had variuos problems with mine. Usualy changing the overdrive filter helps. The 4+3 uses several different sensors to make the shift work and if one of those are out it could cause the problem. I have heard the best thing to do with the 4+3 is to bypass it so you can control when it shifts not the sensors.

Darren,

I have heard the same thing about bypassing the computer control of the 4+3 transmission. I would like to do that, do you have any information as to how I would go about this process?

[Garey Robinson]

i need part#14081168 shaft,1st &2nd shift i can not get first an second gear do you know of any one who may have that part?

[Top of The List]

Swap in a 6-speed T56 and call it a day.

[alex]

american cars are white trash!

[Truckin]

alex wrote:

american cars are white trash!

White trash use AOL like you Alex!

[Ruben]

alex wrote:

american cars are white trash!

White trash? what the hell? Since when are American cars white trash? I'm black, so, I have a Ford F-150 and Honda Accord. My Ford is very reliable, By the way, ALEX, is a white boy's name.

I have no idea where you get what you have to say, but whoever you get it from...that guy is filling your mind with ideas.

Ford is NOT white trash. Why the hell would an african-american man like me have one then?

Ford, is better than the Honda my wife has.

I imagine you as some loser, who thinks he is M&M and drives a 1993 Toyota Camry, because he is to poor to afford something else! Screw off man. Where is your hood? "MAINE"?

Whatever ignorant ba$tard says american cars are white trash, must be a 2 time loser!

The stupidist comment I ever read on http//www.topix.com.

PAH!

[pedro]

my 4+3 transmission does not shift to the overdrive. do some one have information about how can i by pass the computer control ?1984 corvette

[andrew]

Mike, Ryan and Pedro. There is a book called 101 projects for your Corvette (1984-1996). It has the details for putting in a jumper to tell the computer that you are Always in 2nd gear or higher. That is the trick I think Darrin was talking about. The book costs ~$20 and it is way cheaper than taking your corvette to a shop for anything. Plus it has 100 other useful recommendations for these cars. Also there is a lot of useful information at Corvette Forum.com Mine is an '85. ENJOY

[JOHN]

SOME FUNCTION ON A 4+3

ENGAGES WHEN TEMPERATUR HIT ABOUT 180F
NEAR THE POWER BRAKE UNIT THEIRS A RELAY ON THE FIRE WALL THAT CONTROL THE OVERDRIVE THEN ONCE IT ENGERIZE THEIR A PREASURE SWITCH INSIDE THE OD UNIT IT WILL ENGAGE OD WHEN THE PREASURE BUILD UP

[JOHN]

FIND THE WIRES THAT IN YOUR CONSUL THE OD SWITCH CUT WIRES OFF FEAD ON SIDE OF THE SWITCH WITH 12 VOLTS THE OTHER SIDE TO A RELAY COIL FEED THE NO CONTACT WITH 12 VOLTS THEN FIND THE PREASURE SWITCH ON THE SIDE OF THE 4
3 CUT THE 1 WIRE WIRE FROM THE HARNESS FEED THE SWITCH WITH THE WIRE FROM THE RELAY NO CONTACT WHEN YOU CLOSE THE SWICH THE RELAY ENGERIZES CLOSING THE NO CONTACTS AND FEED THE PERASURE SWITH AND ENGASE THE OD UNIT THIS BYPASSES THE ECM AND ALL CENSORS OD WILL ENGAE AS SOON AS U DRIVE OFF YOUR JUST CLOSING IT LIKE TURNING ON A LIGHT (ALL STAR ELECTRIC)[e-mail] ANY QUESTIONS

[Interested]

Garey Robinson wrote:

i need part#14081168 shaft,1st &2nd shift i can not get first an second gear do you know of any one who may have that part?

Did you ever find that part...if not what did you do? Thanks in Advance

[Paul]

I am thinking of buying a 87 with the 4+3 tranny. Does any one know if the 6 speed that came out in 1989 can be put in as a replacement. If so how much would it cost?

[John barnum]

Garey Robinson wrote:

i need part#14081168 shaft,1st &2nd shift i can not get first an second gear do you know of any one who may have that part?

hey Garey im haveing the same prob with my trans getting ready to open it up and take a look no 1st or 2nd.

[Gary]

Hey man, I recently bought an 86 vette with the 4+3. I am trying to learn the tranny in it. I shift 1st to 2nd then it is in OD 2nd,3rd and 4th. Hells bells man, That 86 has 100,300 miles and gets 26mpg.

[Gary]

Anyone knows where I can get a booklet on the 4+3 tranny's email me [e-mail], thanks

[jake]

alex wrote:

american cars are white trash!

Imports are like tampons.Every p ssy has one.

[Jeremy82]

Hey guys. Thanks for posting your ideas on this site. I have a 1984 Corvette with 4 + 3 Transmission and my reverse is not grabbing but my forward gears are working perfectly. My overdrive is not working either. Any ideas?