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GMC 1990 SM465 Shifting Problem

December 30, 2014 - Author: bartbarton

I have a GMC 1990 454 one tonSM465_MTGM010 4WD.

Question:  I have a question on my SM465. When I try to shift into reverse it feels like I’m pushing the shifter through carpet and when I can finally get it into reverse I lose all other gears none of them will remotely engage. And to get it into the forward gears i have to pull the shifter assembly and manually pull it out of reverse. Would you have any input on this? How much would it cost to repair this or should i just buy a new trans?

Answer: It sounds like the rev fork plunger has came out. There should be a retaining clip on the rear of the rev fork plunger… this can be fixed by taking the top cover off and taking the rev fork out, compressing the plunger and welding a steel washer on the back side.

We can do it for you your cost would be $45.00 plus shipping you will need to send in us your cover.

Give Scott a call toll free 888-824-2012 he can help you.  You can see the other parts we can provide for the SM465 on our site.

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Need new ratio SM465 86 GMC Pickup

August 29, 2014 - Author: bartbarton

I have a 1986 GMC 454 2WD 3/4 pickup truck

Question:  I have gmc truck 2wd and has GM SM 465 SM465_MTGM010transmission 4 Manuel speed The factory gear ratios are 1st : 6.55 2nd : 3.85 3ed : 1.70 4th : 1.00 Reverse : 6.:09 I would like to upgrade the ratios without any change in the main transmission body just need to change the rings inside the transmission The ratios that I would like to have are 1st : 3.27 2nd : 1.97 3ed : 1.34 4th : 1.00 Reverse : 6.:09 So the changes will be only in 1st , 2nd and 3ed Please note that the tire height is 33 inch The rpm up to 6200 rpm The rear end ratio 3.73 I need help on that.

Answer: Sorry there aren’t any ratio changes available for the SM465.   You will need to change the rear end ring and pinion your currently have 3.73 we suggest you lower the ratio to 4.56 this will drop RPM on the free way.  You can see the parts we can provide for the SM465 on our site.

 

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Need Stronger Chevrolet GM SM465 Transmission!

March 15, 2014 - Author: bartbarton

I have a Cheyv 1885 3/4ton 4×4 pickup.

Question: I am interested in the 30% stronger SM465?SM465_MTGM010

Answer:

We can build a SM465 and add cryo treatment to the normal brake / wear items we recommend Cryo treating of the input shaft, 3rd gear, cluster gear, L/R Slider, cryo treating adds $10.00 per pound and adds 30% strength to these parts.  Order our part MTGM013-cryo your cost is $800.00 plus $250.00 core deposit plus freight.  For the Cryo treating add an additional $380.00.  This transmission will have a 12 month no hassle warranty. For additional technical information or to place the order give Scott a call 888-824-2012.

See the other parts we can supply for your Chevrolet  SM465 on our site.

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