bcollid

Sorry to start a new thread on an old topic.

I put in 3.73 gears running a 383 and a zf6.

Wow - what a difference.

The car feels scary fast. ( probably isn't really) but sure feels fun

6 gear is actually usable and the car jumps out of the hole.

With the old gears I'd many times bog down on take off at the track and then cross the finish line at only 5300 rpms with a terrible 2.00 60 foot time, running the quarter in 13.00 at 107mph

I'm hoping I can consistently get a 1.8 60 foot time and be in the twelves this year. - but might not have a track to go to with the closing of Gateway in St. Louis

Anyway the new gears feel great.

kimmer

That's one of my next projects.

Baldfart

What gears did you have before?

Mo_Bandy

I have been looking to do the same as well. I had an automatic, dropped in a ZF6 so I'm still running my 3.07's


Good to hear it was worth the trouble bcollid

MO

STL94LT1

http://www.marpark.net/

bcollid

Yeah whats the deal with Marpark:

From the marpark.net website:
Topic: Progress has halted (Read 4,310 times) Shawn (Richter Racing)
Administrator
****
"Thread Started on Dec 23, 2010, 8:35pm »
Well not for a lack of trying to pull this off in a timely manner but yet again the project has stalled and is sitting idle. Ronnie has told me they are still making progress but there is still no done deal. I have closed the store and donations area, it is not fair to continue to sell merchandise until something concrete is pulled together. I refunded the last sale made and there were only 2 so please don't think someone was getting rich off this. I have a lot going on right now and will not have time for emails and questions that should be directed to Ronnie and I am sure he will get to it in a timely manner."

**********************

It would really suck for the MarPark guys if the Gateway 1/4 track somehow opened back up

STL94LT1

Right now there are legal issues between MAR and an opposition group of Eolia residents.

From what I've heard Gateway is on leased land, it will be very difficult to sell or even give away with $5.5m in back taxes owed.

bcollid

I had 3.33 gears. Which was sort of an odd ratio added late in the 1989 model year( I believe)

So like a 14% change going to 3.73

rodj

Going to need some good tires.
My auto 383 w/3.73's kicks the rear sideways on the 1 -2 shift @ WOT with street tires.
1.6X at the track with MT ET streets

bcollid

I have MT ET's... 1.6 would be like sex.... I can only hope

383vett

When my car was on the street, I had 3.73 gears, a 383 with an auto also. Great combination!

JackDidley

Exactly where is Marpark ? The link gave no location. Am I supposed to guess ?

Calderone

i have 3.07 but i always have the 3.73 between the eyes , but my highway mileage will sufferat 100kmh im doing 1800 rpms, i think with 3.73 will do a lot more rpms

tblt44

How hard was the swap?


Yours is a 96 right
what was the cost if you don't mind me asking.
Do you still have the D36 rearend?
I would love to do that just dont know all of what I would need.

TheCorvetteKid

Actually, the 3.33:1 ratio was made standard equipment on ZF6 equipped cars relatively early in 1989 production. Before this change, the early 1989 ZF6 equipped cars had 3.54:1 ratio gears.

So what's the engine RPM when doing 65 mph with the new gears?

My '89 has the 3.33:1 ratio gears... maybe time to consider a change?

rodj

Approx 3100 RPM in D
2800RPM @ 65 w/ 3.33

Play around with numbers
http://www.bgsoflex.com/rpmmph.html

rodj

2100RPM @ 100Km/h in O/d w/ 3.73's

You have so much fun with 3.73's ( if your engine can rev enough ) then you won't be worried about economy

93Rubie

Was that 13.00@107 before or after the 383?

My basically stock LT1 runs in around 109 at the end of 1/4 mile with crappier 2.20ish 60 foot times.

bcollid

Then your basically stock LT1 beats the crap out of my 383!
which puts out about 340rwhp

bcollid

Curious: What is your Elapsed Time with a 2.20 60 foot and 109 in the traps?