Corvette servo's for an H2

[H2BRUTE]

Recently I installed a magnacharger supercharger and happened to be in the dealers for service when the head H2 Technician remarked about my supercharger. He told me that I should install a Corvette servo which will help the rear end/transmission hold up to some of the abuse of the supercharger..Kinda makes sense and all he said was he would install the servo, nothing else was needed..Here's the other side of the coin. The folks who installed the supercharger told me that in his own words, they would install fluid, gaskets, servo, and shift kit. My only warning to you is that when you put a shift kit in those trans, they tend to shift very stiff. Now the tech at the dealers says it's not necessary. The other guy says it is. I throw it out to all you techies who have been there, done that, etc for advice..Thanks in advance, Da BRUTE

[mdoyle]

The cause behind the harder shift is due to the shorter overlap period from reclaibration by the shift kit. Shorter overlaps between shifts reduces some of the heat and stress on the trans at the expense of drivability comfort.

It's one thing in a smaller car, but I wonder how much you'd notice in a H2?

At any rate I don't think a different servo is going to have the same effect as a shift kit, it might *feel* the same but the temperature and pressure in the trans will tell a different story.

[H2BRUTE]

Thanks for the response. I think I understand that you are saying by installing a shift kit, the heat and stress on the tranny will be lessened, but what about the servo, which is what they are saying I should add. What benefit is that and secondly, is it necessary to install a shift kit as well? Forgive me if I am not understanding you correctly, but a lot of this is Greek to me..

[HUMMERcustoms.com/TAZ]

Go with a 2/4 vette servo which will help tranny to hold up longer under the increased stress of HP etc. It will help in line pressure build up mostly to help tranny last longer. I'm thinking about going to the old vacumm control servo instead of electronic so I can make it build even more or less line pressure. Your preventing the clutchs from slipping as much just as you would want to lessen your manual clutch from slipping to much.

Do not use shift kit. In the handheld you used to tune with it may have shift point control already there. It is nice to shorten points some but, keep it where the ride is still nice. If you get a little to much higher on temp gauge in dash add another tranny cooler with it's own fan to work with what you have already. You could just increase the size of cooler but, I find it simpler to add a second one.

Hope this helps. Listen to your Hummer tech he seems to know what he is talking about. There are others here that can help. I have given you what I feel your tech is also trying to suggest and I run allot of HP/TQ and will be adding methanol inj. after new paint job in Jan. 08. Also looking at a 5 speed manual conversion with manual transfer shift so I can run in 2WD as much as I want. It has been done by another shop out west and not a big deal to do this swap. We will start offering it later if it goes well and it is enjoyable as well as liked in car shows which I would think it should be.

TAZ

[H2BRUTE]

Thanks Taz..I really appreciate the expertise and help..BRUTE