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78Avanti

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Posts posted by 78Avanti

  1. Weatherstrip for sunroof

    in 1965-83 Avanti

    Posted

    Good morning,

    I am in the process of stripping and repainting a 78 Avanti II and want to replace all of the rubber and seals.

    I have located a complete seal kit from Studebaker International but they do not have seals for the factory sun roof.

    Does anyone know a source for sunroof seals?

    Thank you.

  3. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted

    This story keeps getting stranger. The torque converter in this car is from a diesel truck and the pan has GMC stamped in it. Can anyone confirm that this was an original configuration?

    I am sure it pulls strong but it sure seems strange. My inclination is to rebuild it to 1977 Corvette specs.

  5. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted

    Tom

    Glad all went well with the removal.

    Your summary of the transmission data is interesting. It continues to add to the data stream that says that Avanti had to buy ahead to get the parts from GM and we need to think along the lines of one year earlier replacement parts on our cars.

    Bob

  7. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted · Edited by 78Avanti

    Bob, the transmission removal was smooth. Thanks,

    I thought you might be interested in the following:

    The parts tag reads C 78 B 585, which would imply a Turbo 400 built in 1978 on August 8th (equal to 585 in a Julian date format?).

    The 'CB' identifies it as a Turbo Hyda-Matic 400, which is confirmed by the position of the modulator on the right front of the tranny (as opposed to the rear, which would be a 350).

    Interestingly, Corvette stopped installing 400s in 1977 and moved to 350s in 78.

    The serial number 78-CB-1485 says Turbo 400 from 1978 unit 1485.

    The Turbo 400s were build for a lot of vehicles, including trucks, which probably explains the 'GMC' logo on the oil pan.

    The only difference is the internal spring that defines the firmness of the shift with soft for cars and firm for trucks.

    Avanti II: stands for Auto of Very Arcane and Non-Traditional parts Integration… II

    Turbo Hydra-Matic 400 Decoding

    Code/Engine

    HP/Vehicle

    CA - 350,396,400,402 (145,160,170,240,255,265hp) 2bbl, Chevrolet, Monte Carlo

    CB - 400,427,454 (180,345,390hp) Chevrolet

    CC - 396 (325,350hp) Chevelle, Camaro

    CD - 327,350,400,402,454 (215,235,240,250,300hp) Chevrolet, Chevelle, Monte Carlo

    CE - 396 (350hp) Chevelle, Camaro, Nova

    CF - 402,427,454 (215,235,270,335,350hp) Chevrolet, Chevelle, Monte Carlo

    CG - 396,454 (265,365,390hp) Chevrolet, police

    CH - 427 (390hp) Chevrolet

    CJ - 396,402 (???,240hp) Chevy Truck 10,20,30 series

    CK - 350 (165,190,195,200,300hp) Corvette

    CL - 427 (400hp) Corvette

    CP - ??? (???hp) Chevy Truck C-30 series

    CQ - 427 (335hp) Chevrolet

    CR - 400,402,454 (170,215,235,240,270,360,390hp) Chevrolet, Monte Carlo, Chevelle, police

    CS - 454 (245,270,360,365hp) Corvette, Chevelle, Monte Carlo

    CT - xxx (???hp) Chevy Truck C10 & C20 series

    CW - 402 (375hp)...Chevelle, Camaro, Nova

    CX - 396,427 (375,425,430,435hp) COPO

    CY - 350,396,427,454 (high shift point) (245,375,425,430,435,450hp) Chevrolet, Corvette, Chevelle, Camaro, Nova.

    CZ - 350 (205,250,255hp) Corvette

  8. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted

    I have adopted a 1978 Avanti II for a friend who took an overseas assignment with the State Department. I need to pull the transmission (turbo 400?) for repair. Is it possible to do so with the engine in the car or does that need to come out as well?

    Thanks, Tom

  10. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted

    Tom

    On both my 74 and 83 there is a plate that spans the X-member in front of the meeting point of the X. It's bolted in and removes readily. The trans is bolted to the plate.

    Here's a shot of the 74 with the cross member in the yellow box. Sorry it's not great but you can see the bolts holding it to the crossmember.

    P1010735-1.jpg

    I've not seen one bolted directly to the X-member.

    Hope this helps.

    Bob

  12. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted

    Tom

    I pulled a 700R4 out of my 83 with the engine in place. They are about 30" long so I think your TH400 should also come out. Most of them run from 28 to 33 inches long.

    Be sure to use a Jack as these things are incredibly heavy. You will need to support the tranny, pull the rear crossmember, loosen the torque converter from the flex plate and remove the trans to engine bolts. Be sure you have enough height to let it down and roll it out. I assume you've pulled the drive shaft and speedometer cable already.

    Bob

  13. 1978 Transmission Repair

    in 1965-83 Avanti

    Posted

    I have adopted a 1978 Avanti II for a friend who took an overseas assignment with the State Department. I need to pull the transmission (turbo 400?) for repair. Is it possible to do so with the engine in the car or does that need to come out as well?

    Thanks, Tom

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