Oddball 5-speed to T-case question

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Re: Oddball 5-speed to T-case question

Post by pdq67 » Sun Nov 11, 2018 6:10 pm

Were there ever any 5-speed OD stick tranny's made that were strong enough to be ran behind a HEALTHY V-8 engine?

Say 500 to 600 hp and 500/550 t?

Or is the only way to run a 4L80 type auto tranny?

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Re: Oddball 5-speed to T-case question

Post by The Dark Side of Will » Sun Nov 11, 2018 7:37 pm

A TKO is good for that power range.

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Re: Oddball 5-speed to T-case question

Post by pdq67 » Mon Nov 12, 2018 6:15 am

pdq67 wrote:
Sun Nov 11, 2018 6:10 pm
Were there ever any 5-speed OD stick tranny's made that were strong enough to be ran behind a HEALTHY V-8 engine?

Say 500 to 600 hp and 500/550 t?

Or is the only way to run a 4L80 type auto tranny?

pdq67
I guess I should have clarified!

A STOCK GM 5-speed stick OD tranny.

Not a Tremac, but rather a stronger P/U 5-speed OD that will shift better than the old 4-speed granny 1st gear tranny's from way back then.

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Re: Oddball 5-speed to T-case question

Post by The Dark Side of Will » Mon Nov 12, 2018 8:19 am

There isn't a car 5 speed I know of that would be fine with that power level. The Toyota R154 and whatever transmission Nissan put in the Z32 300ZX's are supposed to be pretty strong and can tolerate power levels in that range, but 3.0 turbo sixes hit a lot softer than 6.0 N/A V8's and adapting them to an American engine is yet another PITA to go through.

An NV4500 would handle the power/torque, but that's a truck transmission with a granny 1st.

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Re: Oddball 5-speed to T-case question

Post by autogear » Mon Nov 12, 2018 9:57 am

Take a TR6060 from a modern camaro and remove 6th gear? Its a Tremec but its also a stock GM transmission. As was said, nothing else down the GM line can handle that kind of power. Manual transmissions after the 70s were built for specific purposes and theres not a lot of "extra meat left on the bone" capacity-wise.
Another option would be a GForce T5 variant.
Apparently Richmond debuted an off-shore produced, stylized TKO clone at SEMA recently. No idea what its price would be or if its even going to production.
On the cheap end, an Astro T5 gearset in a T5 case will get you probably into the low-mid 400s HP/TQ-wise.

All this is kind of waxing poetic if you have a camaro with stock rear suspension and a 10-bolt. If you car isn't really built for 500hp, then keep some skinny BFG TA radials on it and a stock style clutch. It'll just blaze the tires and the clutch will hopefully be the safety valve.
Better have a scattershield regardless.

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Re: Oddball 5-speed to T-case question

Post by The Dark Side of Will » Mon Nov 12, 2018 2:57 pm

Richmond has their own 5 speed, of course, but that's 5th gear direct and not a factory trans anyway.

Are there class rules mandating production transmissions or is there some other reason not to go with TKO, Richmond, Richmond OD or T56/TR6060? Those are known quantities for handling that kind of power.

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Re: Oddball 5-speed to T-case question

Post by pdq67 » Wed Nov 14, 2018 7:55 pm

autogear wrote:
Mon Nov 12, 2018 9:57 am
Take a TR6060 from a modern camaro and remove 6th gear? Its a Tremec but its also a stock GM transmission. As was said, nothing else down the GM line can handle that kind of power. Manual transmissions after the 70s were built for specific purposes and theres not a lot of "extra meat left on the bone" capacity-wise.
Another option would be a GForce T5 variant.
Apparently Richmond debuted an off-shore produced, stylized TKO clone at SEMA recently. No idea what its price would be or if its even going to production.
On the cheap end, an Astro T5 gearset in a T5 case will get you probably into the low-mid 400s HP/TQ-wise.

All this is kind of waxing poetic if you have a camaro with stock rear suspension and a 10-bolt. If you car isn't really built for 500hp, then keep some skinny BFG TA radials on it and a stock style clutch. It'll just blaze the tires and the clutch will hopefully be the safety valve.
Better have a scattershield regardless.
Bought new '67 350 SS/RS Camaro with an M-20 4-speed and a 12-bolt 3.31 posi rear. Now a 496 at about 550 hp/580 t.

The post below mentioned the Richmond non-OD 5-speed. I wonder how much power it will hold and if it will, just drop my rear end gears down to like 3.00 or maybe lower? My old '80 C/10 6-banger P/U had a 2.76 in it along with a Sag. 3.50 ratio 1st gear tranny, but it had a P/U 12-bolt, not a car 12-bolt rear end.

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Re: Oddball 5-speed to T-case question

Post by autogear » Thu Nov 15, 2018 11:34 am

Paul,

Im not really a fan of a sub-3.00 final drive for most people. Call it personal preference; but rowdy engines don't like cruising at leisurely RPM, without a lot of efi help.

With a 3.31 rear gear, you're going to need to cruise at the better part of 80 to pull 2000+rpm with most overdrives.
If it was us; a 3.31 with a 2.99 or 2.88 1st gear is just about ideal, when you wear out the 3.31; look for something with 3.08s/3.23s.
The re-introduced Richmond OD comes with a .77OD, but is factory rated for your HP/TQ. You'd probably find to use OD efficiently, you need about a 3.70 rear gear, with their 2.8x 1st gear

Another option would be the MY6 4spd OD that New Venture sold to both dodge and GM. Thats an 833 with a single overdrive 4th (well its 3rd but its used as a 4th gear). It has the same ratios as a 700r4 4spd. Its still probably gonna want more rear gear

Nate

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Re: Oddball 5-speed to T-case question

Post by pdq67 » Wed Nov 21, 2018 10:25 pm

Nate,

I had an A833 cast-iron case 4-speed, not the OD one. Big heavy SOB!!

I researched them and it seems that when the 3rd and 4th gears and levers are swapped, it turns into a weak transmission in OD just because of the thinness of the OD gear.

I want to say that I talked to Brian about this conversion for my car and I do know that some of the mid '70's or newer(?) GM diesel P/U's used the OD A833. So a bell housing exists to fit it. I think Brian may not be in the business anymore from I think health reasons, but I may be off here??

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Re: Oddball 5-speed to T-case question

Post by autogear » Fri Nov 23, 2018 12:53 pm

Paul,
I don't have a lot of direct experience with the MY6, my contact for guys looking to get one, or parts/service is Jamie Passon of Passon Performance in Tamaqua PA. He's an 833 specialist

I did hear Brian had retired. If that means hes completely out of the business, I don't know. At one time he had quite a parts horde.
Gary Howard (The MuncieMan) has quite a collection of esoteric things. Hes in PA as well, DBA Gary's Gearbox

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Re: Oddball 5-speed to T-case question

Post by pdq67 » Sat Nov 24, 2018 7:25 am

I guess it boils down to this tranny unless there is another out there besides the big Tremac!

The new Legend Gear & Transmission LGT-700 5-speed transmission.

www.5speeds.com/legend

"The Legend LGT700 is an ultra compact, big torque, fully synchronized high revving 5-speed overdrive manual transmission. It is designed for high performance street and track use. Parts and Accessories----"

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