T5 gearbox conversion

Barwick10 · 2015-01-12T08:51:19+00:00

Cut from my turbo bricks post forums.turbobricks.com/showthread.php?t=244360&highlight=australian+t5%2A Lets look at what common world class T5 boxes ar...

Vee_Que

Alternatively there is a cad file for a plate to suit the commodore v6 box

Dauntless

blondejay;34847 wroteat 2k i would hope the box is fancy internals.
i had a desire to install the counter balance gear to the over drive. which has a habit of destroying the bearing.

Not sure on the internals. $2000 is a pretty fair price, given that a fully rebuilt Toyota W series with decent ratios can be $1500+

deleted_user_160

ive given alex the cad drawing, so acquiring his services im sure will be a good idea i think

nickm

@Dauntless - it appears some of the US folks on TBrix used a DeeWorks / Yoshifab adaptor on their 700s, and used the V8 Mustang T5 'box, but used the shift rod and rear half of a Camaro T5's housing to get that extra length for the shifter.

That box is shorter than commodore box.

So is an extension out of the question ?

Vee_Que

Dauntless;34853 wrote
blondejay;34847 wroteat 2k i would hope the box is fancy internals.
i had a desire to install the counter balance gear to the over drive. which has a habit of destroying the bearing.
Not sure on the internals. $2000 is a pretty fair price, given that a fully rebuilt Toyota W series with decent ratios can be $1500+

Is it? Who pays that much though? I would rather a t56 or R154 box for that sort of money, tougher boxes and the R154 shifts nicer. 50mm for $1500 is a lot of money, rebuilding a box isn't that big a deal either considering parts for a T5 box are max $450.

Vee_Que

Going by that, if you use the V6 commodore input shaft with a thick spacer to make the difference, you COULD get the box back far enough. Or even a V8 Falcon shaft could get the extra distance. I had an EA Falcon t5 till I sold it last year as I didn't care for it as I don't think it was WC box, but it may have been... :s

carnut1100

Falcon V8 is WC, six isn't

Dauntless

More information from Mal Wood. A TKO cannot be specified with a shifter far enough back.

A T5 can be supplied with a special rear case and mainshaft to get the shifter in the correct location for $2060.

For a fresh gearbox, choice of ratios and torque ratings, correct input shaft and correct shifter location, that's actually a pretty good deal in my opinion.

Vee_Que

If the car was making 350hp with a fresh engine and had good bodywork and was a clean car all around. I'd agree. I'll stick with an auto in my cars as they cost less than $700 for a rebuild with a stock rebuilt converter.

The ea didn't have a wc box. After that they did.

Major Ledfoot

nickm;34877 wrote
@Dauntless - it appears some of the US folks on TBrix used a DeeWorks / Yoshifab adaptor on their 700s, and used the V8 Mustang T5 'box, but used the shift rod and rear half of a Camaro T5's housing to get that extra length for the shifter.
That box is shorter than commodore box.

My bad then, but the Mustang / Camaro hybrid V8 box installation does seem very similar to the Commodore V6 one.

This is the article which has the installation of the hybrid.

forums.turbobricks.com/showpost.php?s=2449e2b172e587a8c715841915603743&p=2468603&postcount=1

YMMV, but the results look about the same.

Commodore V6 box ...

.. versus hybrid V8 box

If memory serves, there used to be an oil relief trick done on the 3rd gear wheel by the production car racers when they had that 6 cylinder Holden v Ford thing going in the early 1990s.

The Mustang V8 T5 (1352-000-251) is rated at 330 lb/ft according to Tremec's documents. What is the max torque rating of the Commodore V6 T5?

penta242gt

If the commo box is a world class t5 lb/ft will be the same rating

nickm

carnut1100;34888 wroteFalcon V8 is WC, six isn't

Depending on year

Major Ledfoot

penta242gt;34917 wroteIf the commo box is a world class t5 lb/ft will be the same rating

All Commodore T5s were WC*, but not all WC boxes have the same torque rating.

therangerstation.com/tech_library/T5ID.htm

EDIT: Correction: Not quite all Commodores - VK-SS, VK Group A, VL V8, and VL Brock Group A used NWC T5s.

nickm

The bearings and such are all the same. The 2.95 gear set receives a higher torque rating, there is a billet plate for the layshaft that upgrades a weak point in the box.

So changing the gear set upgrades the box torque rating. I think most red blocks will have a problem breaking these boxes.

Dauntless

What is the highest torque rating available for the 3.25 gearsets? 2.95 isn't really practical on a 4 cylinder. Even 3.25 with a 4.1 diff could be marginal when used for towing as my car is.

nickm

Looks about 265 ft/lbs 365nm. Not sure how much strength the billet plate adds.

moderndriveline.com/Technical_Bits/t5_history.htm

nickm

oh and the US V8 is significantly shorter look at pictures of the boxes in relation to the rear seals vs shift housing.

nickm

Alex.....I did contemplate using the commodore input shaft and a thick plate but finding a billet that thick and the machining cost ruled it out, so
I was going to play around with shifter options if it came up short.

deleted_user_160

what shifter options?
im looking at making another middle section of the shifter so it sets the knob back 2" just going to cut it out of 1" alloy

nickm

Basically that Jay

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