Finally changing to 4:10 gears......any other tips, tricks or recommedations?

[Gunny]

Hey Craig,

If you're still active duty, you need to get serious about getting someone to assign you about a week of TDY in Bowling Green around the 2nd or 3rd week of May. Or if you should get TDY to Gordon at the same time I'll loan you a spare for a road trip to BG (have to flip you for a Z or a C5, that's all I got).

Hawaii is rapidly rising on my bucket list of places to go ... haven't visited in over 30 years (was actually there for one week TDY) and my wife has never seen Hawaii, so we're doing some serious planning for sometime in the next 12-18 months. We would be tourists who are also visiting a former co-worker who retired there, but would definitely hook up with you for some local food/drink.

Good luck with the gears ... and definitely get one of those tranny/ATV lifts ... really makes a difference.

George

Originally Posted by tuband

Hey Craig,

If you're still active duty, you need to get serious about getting someone to assign you about a week of TDY in Bowling Green around the 2nd or 3rd week of May. Or if you should get TDY to Gordon at the same time I'll loan you a spare for a road trip to BG (have to flip you for a Z or a C5, that's all I got).

Hawaii is rapidly rising on my bucket list of places to go ... haven't visited in over 30 years (was actually there for one week TDY) and my wife has never seen Hawaii, so we're doing some serious planning for sometime in the next 12-18 months. We would be tourists who are also visiting a former co-worker who retired there, but would definitely hook up with you for some local food/drink.

Good luck with the gears ... and definitely get one of those tranny/ATV lifts ... really makes a difference.

George

Hey George,

I'm on the fence to retire and not sure if I will stay here. As you know $650K buys you an average, if that home and with the equity I have I can buy an awesome home in other place for cash....so I might take the $ and run. I thought about going to BG again and thanks for the offer; you make it so tempting.

Please do visit with your lovely wife and we'll be sure to show you a great time and help our with tours and nice places to go to. Your Southern hospitality was the best for a stranger like me when I was in your neck of the woods and I won't forget it. I have all the stuff coming that Phil recommended and Bill the ZF Doc was so kind to help me with doing the speedo gears. Yes, I have to get one of those jack; thanks for the recommedation. We'll touch base off line and thanks for the hard work with the membership.

Aloha and look forward to seeing you again,

Craig

Well, only a year later (man, am I slow) to the day and I finally got this almost done.

Thank you everyone for all the help with tips and tricks and especially JAMES93LT1 for coming over several times and helping with the posi rebuild and all the other tech advice; I owe you big time.

Thanks Phil for all your advice/emails and I bottom tapped for the studs and also have my drain plug installed (with magnetic plug). The case has been cleaned up as well as and ready for detailing. Decided to do same with the stirling silver POR-15 to case as I did with the batwing and yoke ends black POR-15. I decided to detail everything including the spring and will also buy the longer bolts to drop the rear about an inch.

Next week everything goes to a local shop to install the 4:10s, replace the seals, bearings, etc. I decided to just stay with the Yukons and hope it will hold up well.

[tf95ZR1]

Its been said before, but you will LOVE how the 4:10's
wake up the car. Definitely a worth while mod. Let us
know after your first drive.......

[flyin ryan]

Originally Posted by tf95ZR1

Its been said before, but you will LOVE how the 4:10's
wake up the car. Definitely a worth while mod. Let us
know after your first drive.......

I agree with Ted, stock or modified, dollar for dollar, best money you will spend, (& most fun ). Makes the car so much more fun to drive in every gear, should have almost been manditory from the factory, minus the gas saver political B.S. car manufacturers have to go through.

[GOLDCYLON]

Originally Posted by flyin ryan

I agree with Ted, stock or modified, dollar for dollar, best money you will spend, (& most fun ). Makes the car so much more fun to drive in every gear, should have almost been manditory from the factory, minus the gas saver political B.S. car manufacturers have to go through.

Have you done this to all your ZEDS Ryan? Ive been thinking about this one. Love the drain plug idea. Is the 4:10 too agressive for a daily driver? (I cant beleive I just asked that lol). Damn this car is a disease lol. I need to ask Phil if hes done this one yet as well

[tomtom72]

Originally Posted by GOLDCYLON

Have you done this to all your ZEDS Ryan? Ive been thinking about this one. Love the drain plug idea. Is the 4:10 too agressive for a daily driver? (I cant beleive I just asked that lol). Damn this car is a disease lol. I need to ask Phil if hes done this one yet as well

Warning: typical noob Q about to be asked!

I understand the quicker trip up in rpms idea, but doesn't that make our first gear all that much more useless? Also, my guess is it will be easier to blow the tires off in 1st? Obviously, I don't think I "get it" with this swap.

Where I live & drive ( NYC/Metro suburbs ) I don't even use 6th any more, heck sometimes I never get to 5th. I know my gas mileage sucks; I have a Cobalt for that! I understand that the 10's make 6th more usable, but then you loose it at the other end. I guess I'm the only one that feels 1st is useless in the stock configuration?

Confession: My 72 LT-1 had a 2.20 1st gear ( all '72 C. R. M/T sb vettes had this no matter M21 or M22 ), combined w/ 3.55 gear = 10 mph per 1,000 rpms in 1st gear. Therefore in 1st, 60 mph = 6k rpms; 70 mph = 7k rpms. That was really useful for those really slow & tight 1st gear corners. I kind of enjoyed that. This car has no valve train garbage, it would be really sweet to have a bit more "room" in 1st, no? I guess I'm out in left field one this one, right? Sorry for seeming to be so obtuse.

Thanks for the replies and I can't wait to try them out; it will be a few months as I am still waiting on the top half porting work and some other bottom half components. I am sure it will awesome with all the other upgrades being done at the same time. With the aluminum flywheel too it is going to scream to redline and cause traction problem as well as create a tricky launch.

Tom,

I think the gearing upgrade is not for everyone and I hope I don't decide I want to change back (I doubt it in my case). I read all the pros and cons about it and several folks changed back to 3:45 as you have probably read too. I would think it would be for you in the city area as it is for me on this island where I feel I need the lower gears. I don't even get the chance to use 5th gear either; I think it will be fun though and looking forward to it.

[Dynomite]

Originally Posted by Jagdpanzer

You might also have a drain plug installed like in this pic while you have the case at the shop. Makes it a lot easier to service next time.

I am thinking I will install a drain plug without splitting the differential case

I will then flush out any debris after drilling and tapping and install a magnetic plug

That will be easier than using a pump

That does not look like a 91' case? I have to know exactly where to drill on a 91' case to get the low spot on the flange. I think if I drill just to the South of that lower middle bolt (Z facing west) I will be fine

[Dynomite]

Originally Posted by GOLDCYLON

Have you done this to all your ZEDS Ryan? Ive been thinking about this one. Love the drain plug idea. Is the 4:10 too agressive for a daily driver? (I cant beleive I just asked that lol). Damn this car is a disease lol. I need to ask Phil if hes done this one yet as well

If the daily driver is the car.....I dunno....if the daily driver is you....definitely not
This car is not a disease but it is definitely habitual