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Best easy to find tranny for my L20


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Looks like i gotta replace the rear main seal in my 620 lil'hustler w/L20 and 4speed tranny.   The engine I'll keep til i die. the tranny is a good 4 speed. Will do nothing but replace the rear bearing unless i can find a 5 speed that let me go 80-90 mph with less rpm.  I'm clueless about tyranny's that can bolt to an L series motor.  I know the 200sx had a 5 speed. Heck I sold 1 years ago.

 

 Should I just be satisfied with 80 mph on a 4 speed? All I gotta do is replace the rear main. I'll do more if it's beneficial, but I've got a pretty good combination with the L20b/4speed tranny as it is. I just could kick myself for letting the rear main dry out - I didn't drive this truck for several years and feel that's why the rear seal's leaking.

 

I'm not lazy.  I've learned a ton and made many mods from this site. A link or 2 on transmissions that bolt to an L block that are around? Change the bellhousing?  Not ready to start a time consuming project. It'd be great if there was a good 5/6 speed manual tranny that would bolt up from a 300z .

 

BIG THANKS  -  to datzenmike  for retrieving my old username.   I'd breech the subject of photofukit and lost memories but it hurts too much rite now! 

 

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TLDR - is it worth looking for a better tranny than my 4spd to install on my L20b just cause i gotta replace a leaking main seal?P_20210329_143809.thumb.jpg.d5bdd5280b3a333572f03832a8c09136.jpg

 

 

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Your profile says S10 and 620 so is that an S10 200sx? or a chevy truck? and what year 620? (it may be in a previous post but I can't be bothered and I don't remember) because this all factors into what 4 or 5 speeds you can use.

 

Rear main seal? Not the engine? you mean the rear seal on the transmission that the driveshaft fits into?

 

 

Lets cut to the probable chase. If it's the transmission seal then fix it. Faster easier and cheaper than another unknown transmission. They are less than $5.

A four speed is fine at any RPM the engine can attain. If this is a '74 or newer the transmission is from a six cylinder car and more than strong enough for an L20B.

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Posted (edited)

I only speak of my datsun 620 truck on this forum. L20b /w 4spd manual.  The rear main seal is the one at the back of the engine that surrounds the crankshaft. I'll probably just change the rear seal, but it's not too hard to jerk the engine and tranny out as 1 with my big ass engine hoist. I'd spend a dollar or two on a 5 speed tranny if it fit to my l20b and the shifter came up thru the floor like it should.

  Honestly, I just told my grandson he could help with the repair cause he luvs this truck. ..and it is leaking oil at the back of the engine.

 

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S10 200sx? or a chevy truck?

- I have an old 1998 S10 chevy truck. 

Edited by kgrantkey
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The 4 speed came in one of my pre 1979 datsun trucks. If my memory is correct the 4spd i have is a better model than the 4 spd i thru away. I know there waqs a reason i kept one over the other.

 

...but it's midnight here and i'm gonna lay down.

 

Thanks again for retrieving my username. I'll try to get the list of vehicles and shit straight pretty soon.

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IMG_20171128_170004.thumb.jpg.ddbc8fcd16d92b8efed2fd8d01b8c927.jpgOK. that probably settles it. Not gonna change driveshfts. I'll keep the 4 speed. I do catch myself once in a while going for 5th.  Don't drive it much but starting to clean out my junk and alot of it bolts on this truck. 1978 yellow 6IMG_20171128_170004.thumb.jpg.ddbc8fcd16d92b8efed2fd8d01b8c927.jpg20 w/4spd manual.

Edited by kgrantkey
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Posted (edited)

Still driving my lil'hustler on occasion. It still has a small leak when the engine is running close to the area where the tranny and engine connect.  If I had cranked it every few months I don't think it would be dripping fluid, but let it sit far to long without cranking or driving it.

 

 Gonna drive it to a small business near my house to empty the trash out of the bed.  I promise one day I'll spend a month or two putting this truck back into shape. I have mad the decision I'll have it til I die or forget i'ts mine.

 

Thanks for this site.  May be one of the oldest forums I've ever belonged to, and without a doubt the most informative on the Datsun's.

Edited by kgrantkey
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