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Posts posted by WayneC

  1. Hello, could someone tell me what standard size ring and pinion should be on my stock 1987 avanti. It is somewhat sluggish off the line and I thought about changing the ring and pinion gears to help with this. I do not know where to find out what size I already have to be able to shop for different gears. Has anyone changed out gears before to help with this porblem? Help is needed.

    I can't answer directly, but I think your car has a GM 10-bolt differential (count the bolts around the outside of the rear of the differential case) and I would guess the standard axle is a 3.08. You can determine your present ratio by lifting the rear wheels off the ground with a floor jack or two, and with the transmission in neutral, put a mark on the driveshaft and on the outside of a tire, then rotate the driveshaft slowly until the tires make one revolution (someone else needs to watch the tire mark), counting the differential revolutions (better yet, rotate the tires ten times while counting driveshaft revolutions, then divide the driveshaft revolution count by 10).

    I think higher ratios of 3.42, 3.73, 4.10, and 4.56 are available for your differential. Bear in mind that changing the differential ratio will cause speedometer error, and your highway mileage may suffer.

    Any good driveline shop should be able to make the change.

  2. I have a 1987 Avanti convertible. The master cylinder needed replaced, so I purchased a 1987 Monte Carlo master cylinder. It was not the same set up as the master cylinder on the car.  What master cylinder would a 1987 Avanti take?

    I don't know if this info is pertinent, as I don't have an 87 (mine are 71 and 80), but I sometimes write part numbers in my Avanti parts book when I see them, and I have these by the master cylinder entry:

    NAPA 36259 (NAPA parts stores)

    EIS 64874 (industry standard number, brake suppliers/wholesalers might have them)

    Might be worth looking to see if either might be the one you need.

    Or, sell me your car and let me worry about it :>)

  3. Do you have a Stude Avanti shop manual? That has a wiring diagram, and the same harness was likely used for a few years of the Avanti II, with additions for new/different accessories. Unfortunately it leaves out most accessory circuits. There weren't, to my knowledge, any diagrams published by Avanti Motors for the Avanti II cars.

    I've seen the Stude diagrams alone for sale on eBay, in paper color reproduction ($20+ shipping) and on CD ($6 + shipping), but I think for the price you'd be better off with the shop manual since it has much more information than just a wiring diagram.

    I do have a booklet of xeroxed hand-drawn sketches of partial wiring diagrams for some circuits of various year Avanti II's that was put together by an individual "E.J.J. 3rd", titled "Avanti II Electrical Circuits Block Diagrams" copyrighted in 1990 and sold via an ad in the AOAI magazine, I think (about 25 pp). I can't recall for certain where I got it. Unfortunately there is no contact info in the book, and it contains only partial diagrams (apparently sketches the author had made while chasing problems), for circuits like the antenna, radio, power locks, burglar alarm, cruise control, etc.

    You might try contacting some of the parts vendors to see if they know of anything (Nostalgic, for instance)

  4. I'd suggest the older large Recaros, like the ones used as an option in Avanti II's of the late 70's & early 80's. You just need to go to a salvage yard and look around, as those seats (I want to say Recaro "C" seats, but I'm not certain) were used on a wide range of cars, including Mercedes, BMW sedans, Cadillac Allante, etc. If I'm not mistaken, you can even still buy adapters for them new from Recaro for the Avanti.

    Another possibility would be Jag XJ40 seats, which are very comfortable, not quite as firm as the Recaros.

    Here's a link to an Avanti recently on eBay that had Recaros:


    Here are some links to seats now on eBay(or recently sold) :






    Tell us what you're looking for in terms of color and material. I have a very nice pair of Recaro (I think) seats in a very dark brown (almost black) soft woven material that I'm not sure I'll ever use, because I also have another tan leather set (from an Allante) I hope to make use of in a long-term project car.

    One problem with seats is that they are expensive to ship (heavy and bulky) so it's probably best to find some within driving range. Recovering them can be very expensive, too, but may be necessary to complement your car, and new foam cushions may be hard to find.

  5. here's a some numbers I had written down for the rears, but I've had the numbers quite a few years now so I'm not sure they're still valid:

    Koni 8240 (F?) -1012 (502)

    Koni 82-1425

    Gabriel 26177

    Monroe gas 5831

    Sears Classic gas 91103

    One owner reported using shocks for a 70's Camaro by inserting the crossbar from his old shocks into the upper mounting hole on the Camaro shocks.

  6. Here is what an Avanti steering wheel normally looks like:

    http://www.avantiparts.net/UCBlack698.jpg (on a 69 Avanti)

    It uses the "blades" in the two spokes to operate the horn.

    When an aftermarket steering wheel is installed, normally it comes with an adapter hub with a decorative plastic external round hub cover that has an emblem or name of some sort on it, and that center hub is depressed to sound the horn, ie, the hub is a horn button. The adapter bolts to the steering column, the wheel to the adapter, and the horn button/hub cover generally snaps into place on top.

    Nardi Classico is an aftermarket wooden wheel commonly used on Avanti's, it looks like this:


    One of the most common aftermarket wheel makers is Momo, who offers a wide variety of styles; they use the center hub as the horn button. See them at this site:


    (click on "Momo", then "steering wheels", then pick a style from the drop-down list)

    Yet another maker is Grant:


    You may have to remove the hub and the steering wheel to figure out what your car has in the way of horn provisions. If no attaching screws are present, generally the decorative hub cover either is pried up, or you press down on it and rotate it in relation to the wheel to free and remove it.

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