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Posted: **03 Oct 2009 14:06**

how much oil should I put in a lt77 gearbox and what grade? all the motor factors have is generic gear oil unless I can tell them a viscosity?

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Posted: **03 Oct 2009 14:32**

Many threads on this subject - and almost as many different answers! General feeling is that a good 'Manual Transmission Fluid' works well - although the original oil was specified to be EP75/80.

Posted: **03 Oct 2009 14:42**

Hi,
I use a good quality semi-synthetic x75W-90 seems to work fine for me.

Danny
1980 TR7 fhc Brooklands green
1967 Spitfire Mk3 Signal red
1953 Ford Anglia E494A Black
View my Blog http://www.waringstowntr7s.co.uk/blogs/index.php/danny
http://tr7-n-spitfire.blogspot.com/

Posted: **03 Oct 2009 14:51**

2 Quarts of Pennzoil Synchromesh Manual Transmission Fluid ($7.99 US/QT).

jclay

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Posted: **03 Oct 2009 14:58**

For the 5 speed gearbox 1.5 litre of Castrol SMX-S.
Halfords Â£12.99 a litre.

Posted: **03 Oct 2009 15:05**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jclay

2 Quarts of Pennzoil Synchromesh Manual Transmission Fluid ($7.99 US/QT).
jclay
<hr height="1" noshade id="quote"></blockquote id="quote">

+1 !! Has improved my trans in every wedge Ive owned that I used Pennzoil in!

Johnny

Posted: **03 Oct 2009 15:06**

Steph,

Don't be tempted to use or top up with EP90 hypoid oil as per the rear axle spec in the LT77 box. It'll be impossible to select 2nd gear when cold and difficult when warmed up. Automatic Transmission Fluid ATF gives a good gearchange but not enough protection to the box.

Adam

TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, S/S Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes all round, Anti- Dive, Top Roller Bearings, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights. No Door Stickers. Mine since July 1986, V8 from 1991

Posted: **03 Oct 2009 16:34**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by windy one

[quote]Originally posted by jclay

2 Quarts of Pennzoil Synchromesh Manual Transmission Fluid ($7.99 US/QT).
jclay
<hr height="1" noshade id="quote"></blockquote id="quote">

+1 !! Has improved my trans in every wedge Ive owned that I used Pennzoil in!<hr height="1" noshade id="quote"></blockquote id="quote">

Is that available in the UK, and if so, where from?

Cheers.

The pheonix rises from the ashes - just give it time!

http://s733.photobucket.com/albums/ww338/macmattom/

Posted: **03 Oct 2009 16:36**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by trv8

For the 5 speed gearbox 1.5 litre of Castrol SMX-S.
Halfords Â£12.99 a litre.
<hr height="1" noshade id="quote"></blockquote id="quote">

I've seen this stuff mentioned a few times, but does it solve the problem selecting 2nd gear that appears to affect a lot os "lesser" oils?

Cheers,

Mac

The pheonix rises from the ashes - just give it time!

http://s733.photobucket.com/albums/ww338/macmattom/

Posted: **03 Oct 2009 17:02**

Never use anything but GM Liquid Gold or the Pennzoil eqivalent in a LT77 or R380! IMHO...

The LT77 takes 1.6 litres and the R380 takes 3.5 litres.

GM Synchromesh Transmission Fluid:

Pennzoil Synchromesh Manual Transmission Fluid:

My two 1980 Wedges...

Posted: **03 Oct 2009 17:37**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">[i] Automatic Transmission Fluid ATF gives a good gearchange but not enough protection to the box.<hr height="1" noshade id="quote"></blockquote id="quote">

I've got a car with the LT77 which was filled with ATF right from when I fitted it, and it's gone through 2 owners since who used it as their daily driver for 20 years between them, without any problems at all, so I'd beg to differ on that. Now back with me and it's not the gearbox that's the problem.........

Posted: **03 Oct 2009 17:41**

right, i would never use anything other than ATF. it is much more than capable to lube and protect the LT77

tom

it's not how fast you go, it's how quickly you go fast

Posted: **03 Oct 2009 17:46**

I have not been able to find Pennzoil MTF in the UK (even Googled) so use Dexron II ATF to spec M2C 33G (by Comma) as in the Handbook. It has not given a problem (yet!) but I don't do a high mileage.

Alan
Saab 9000 Stg 1
Saab 9000 2.3 FPT Auto
'81 TR7 DHC

Posted: **03 Oct 2009 17:57**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">[i]so use Dexron II ATF to spec M2C 33G (by Comma) as in the Handbook. <hr height="1" noshade id="quote"></blockquote id="quote">

Dexron II can't meet M2C-33G spec because that spec is specifically NOT Dexron type. I wouldn't use Dexron type fluids because they have friction modifiers in them which could affect the operation of the synchros. M2C-33G however doesn't have the modifiers in it, and doesn't get as thin when hot as the Dexron does, and that is what I have always used, and will continue to do so.

Posted: **03 Oct 2009 18:25**

I use the Pennzoil Synthetic gear oil GL5. $13/litre Cdn. I still double clutch into second when cold but it's the best you can buy. It had regular gear oil in it but in Sacaramento you probably don't get much cool weather. Don't know how worn the second syncro is at 90,000 miles but it was an improvement. I believe Mildred who was an ATM proponent switched to Synthetic and she said it was better. Correct me if I'm wrong Mildred.

TR7 Spider - 1978 Spifire - 1976 Spitfire - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra

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