gear ratio for a sm465

[yeti]

I recently needed a new trans and had the 465/205 laying around. With this trans My '82 GMC is screaming at 50 mph. I want to get a better fuel mileage out of it. I'd like to do more than 45mph too. Does anyone out there have a 6.2l backed up to a 465/205 combo? If so what gears are you running?

[snoman87]

I have a 465/241 combo, same final as your 465/205 ... 1:1. I definately feel that OD is needed as I am screaming down the highway even with 33" tires and 3.73 gears.

If you have the cash a NV4500/205 or 208/241 combo would work well for you.

[HammerWerf]

Yeti,

My 2wd 84 has the 465 trans, 3:73 rear gear, 265/75-16 tires. The engine can roar at the speed limit. It's funny, but my 83CC with a 4:10 gear and a TH400,the exhaust note is quieter at highway speed. An OD would be helpful. Been thinking about it.

Snowman, Since the clutch in my truck is manual (rod & linkage) how well does the newer NV4500 / ZF/6 transmission fit with the existing clutch, or is an upgrade necessary?

HammerWerf

[TB1]

Advance adaptors makes a bell housing kit for this conversion (manual clutch linkage ) I think it is about $360

[snoman87]

Originally posted by HammerWerf:
Snowman, Since the clutch in my truck is manual (rod & linkage) how well does the newer NV4500 / ZF/6 transmission fit with the existing clutch, or is an upgrade necessary?

HammerWerf HammerWerf,

To my knowledge the existing manual clutch linkage would have to be swapped out for the hyro version. Not really all that hard to do. Replace the bracket under the dash, drill a couple holes and plumb some new hard lines, not much different than converting a cab from auto to manual. Then install your hyro bellhousing/trany and enjoy ... a ZF6 would really be nice. I find shifting between 2nd and 3rd to be needing another gear which the ZF6 has!!!


Originally posted by TB1:
Advance adaptors makes a bell housing kit for this conversion (manual clutch linkage ) I think it is about $360 If this is going to see 4X4'ing it's just not worth investing money into a mechanical clutch linkage setup ... switch to hydro and be happy.

[TB1]

That's true. Advance also makes a bell housing kit for hydraulic clutch set ups that will work with a passenger side drop t case like the 205 or 208 ( 208 will bolt right up to a NV 4500). The stock bell housing(NV4500) will not work because the release fork is on the passenger side of the bell housing.

[snoman87]

If you get a 94' or newer bell housing you'll be OK ... the clutch release is internal to the bell housing and resolve the passanger side drive shaft interferance.