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View Full Version : 4.10 Gears!

BlackZR1
08-26-2018, 10:51 PM
Been a great ZR-1 weekend. Went to Carlisle on Friday then spent Saturday installing a swap-out diff with a 4.10 gearset.
Big shout out to Phil Wasinger - He rebuilt a 2nd-hand Dana 44 for me: Viper gearset, new clutches and bearings. Contact pattern is picture-perfect! I am saving my original 12k mile original diff intact.
Also added ZF Doc beam plates and Marc's speedo correction gears.
Thanks also to Dempsey, he gave me a few tips as we chatted for a while at his Carlisle booth on Friday about wrestling the C-beam out.
Here are a few pics. I made up a fixture to keep the diff square on the hoist so that I was able to handle it as a 1-man job.
And she runs great!! Can't quite lift the front tires off the ground but a nice upgrade.
emmvette
08-28-2018, 04:59 PM
A great upgrade for more zip from the ZR-1!
BlackZR1
08-28-2018, 09:04 PM
It was an enjoyable project and I was able to put my new lift to good use.
Phil had the case bead blasted and added the drain plug for me.
Here is a pic of the gear pattern he achieved.
Regimof3
08-29-2018, 01:08 AM
Driving impressions?
Norwegianmopar
08-29-2018, 09:46 AM
Agree, 4:10 is a big difference to the original 3:45. Could never go back now [emoji16]

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ZR1North
08-29-2018, 09:52 AM
Well done. I found this to be a great mod. One may have an extra shift in the 1/4, but so much better for street and road course. With headers and Corsas, I can cruise at 75 in 6th at about 2200 and have an easy conversation with the passenger.
BlackZR1
08-29-2018, 01:30 PM
Driving impressions?

I've only had it out for a drive once so far but there is no mistaking the extra oomph on takeoff. I have new Michelin Pilot sports. They are a little taller than stock size. With the 3.45 in first gear it took a bit of clutch to get some wheel spin but I could not sustain spin. Now the tires will spin as long as I keep my foot on the gas:dancing

There is a straightaway near my house. Used to be that I would enter the straightaway at 20mph, downshift to first in a rolling takeoff and hit 7k fairly quickly and i was at 90 barely into second gear. Now i reach 7k in first so quick I was not prepared to shift so quickly.

Can't wait to take it out again!
BurnRubber
08-30-2018, 05:41 PM
Nice. Thanks for the pics. I find that I do alot of 1 to 3 shifts with 4.11s in town. Thats kind of a good thing since its usually the 2nd gear synchros that go bad in in ZF6s.