seanof30306

iTrader: (4)

So, I have an LO3 WC T5 with the .63 5th gear. I understand the only difference between it and the LB9 WC T5 is the LB9 T5's .73 5th gear.

Is that correct?

If so, can you upgrade to the .73 5th gear simply by swapping them out?

If so, does anyone know of a source for the .73 5th gear?

Thanks

chazman

iTrader: (4)

I'm not sure it's really worth the trouble.

midias

My 84 TA with a L69 and T5 had the .73 I changed to a .63 when I got my new trans. I could have kept the .73 but I gained about 10mph at the same RPM with the new .63 I like it better because I use the expressway every day.

With 3.73 and .73 I was in 5th by 40 when cruising.

seanof30306

iTrader: (4)

So, my other car is a Jeep Cherokee, and I drive it most of the time. On the highway, at 65 mph, it pulls about 2400 rpm.

Mt Firebird has 3.42 gears. I think they're the perfect gear for what I do with the car, with one exception. I don't have cruise control, and when I'm cruising on the highway, my ear always finds that 2400 rpm mark I'm used to in my Jeep. The problem is, that's 80+ mph in my Firebird. The highway I take to work every day has a 60 mph speed limit in town, and 65 mph out of town. They enforce it. In the past 10 years, I've gotten 3 tickets in the Firebird for that.

I've got to have the transmission rebuilt (again). I figure as long as I've got to do that, I might as well get the 5th gear I want while I'm doing it.

I know there's no source for new ones. I saw something on the internets from a guy who rebuilds Mustang T5s saying he could give a 2.95 first gear transmission an overdrive of .63. .73. or .83, depending on the gearset combination he used. Haven't been able to get ahold of him to learn more. Does that make sense?

What are the tooth counts on the .73 5th gearset?

paul_huryk

I thought the non WC T5 had a 2.95 1st gear, where the WC T5 had the 2.75 1st gear?

seanof30306

iTrader: (4)

Everything I've seen says the WC is a 2.95 1st gear

jmd

iTrader: (4)

There is no 2.7x first gear T5 (with OEM parts; maybe Astro or someone makes a gear set.)
Sean, I will see what I have here.

seanof30306

iTrader: (4)

"Can 5th gear be geared down or up from stock overdrive?

Yes, 5th gear can be changed from .68 to .73, .80, or 90. .63 can be changed to .59, .73, or .83"

http://www.moderndriveline.com/md_fa...shtml#02136553

seanof30306

iTrader: (4)

Gracias Senor.

I just had a conversation with Paul at Modern Driveline. Very nice guy. A lot of what he said was over my head, so be patient with me.

He said the .73 5th gearsets are no longer available. He's getting ready to have them produced for 28 spline mainshafts, and it wouldn't be a problem to have them go ahead and make them for the 27 spline mainshafts, too. He's at least 3 months from having those parts though, so no bueno for me.

He said he could give me a .8 5th gear by swapping to a Ford mainshaft. He said he'd also have to swap some parts to get my speedo to work. All new parts, about 550. Gotta think on that one. I really like the idea of the .8 OD and all new parts, but that's a little steep. Here's the .8 gearset:
http://www.moderndriveline.com/Techn.../80gearset.htm

The simplest solution would be to just find a good, used 55 tooth / 31 tooth 5th gear set. That's the LB9 5th gear set. I looked on ebay and in the classifieds here. No luck so far.

seanof30306

iTrader: (4)

Also, the V6 GM T5s had a 53 tooth / 23 tooth 5th gearset for a .76 OD. Will these fit my T5? If so, it's an easy fix, they're everywhere.

EDIT. OK, scratch that. V6 gearset es no bueno

jmd

iTrader: (4)

PM sent.