72 LS5 4 speed
Thread Starter
Intermediate
Joined: Apr 2024
Posts: 40
Likes: 5
72 LS5 4 speed
Need to find a rebuilt differential. Thinking of going to 3.70 gears and possibly a Tremec 5 speed Engine has about 2000 miles on a stock rebuild, is plenty strong and smooth with HEI ignition, headers and Holley low profile 650.
Any thoughts?
Any thoughts?
Melting Slicks
Joined: May 2021
Posts: 2,256
Likes: 1,298
From: Fleming Island, FL
The only thing I would suggest get the close ratio TKX (2.87 to 1 first) with the 3.70's. I have 3.73's with the close ratio TKX in my Cuda and it gets the car up and running pretty quickly. No need for any more gear reduction.
Thread Starter
Intermediate
Joined: Apr 2024
Posts: 40
Likes: 5
Thanks for the info Fly Skids up.So what is the story behind your name? I am a retired Army helicopter pilot. Sounds like we might have something in common
Melting Slicks
Joined: May 2021
Posts: 2,256
Likes: 1,298
From: Fleming Island, FL
Last edited by Fly skids up!; Jan 26, 2026 at 10:47 AM.
Racer
Joined: May 2025
Posts: 306
Likes: 44
From: Georgia
That would be Fun.
How far/long can you fly w/out refueling? Beach or lake would be fun. What is the biggest trick you can do? Do you ever do a "Buzz by" on individuals or animals? What the top speed and altitude?
How far/long can you fly w/out refueling? Beach or lake would be fun. What is the biggest trick you can do? Do you ever do a "Buzz by" on individuals or animals? What the top speed and altitude?
Thread Starter
Intermediate
Joined: Apr 2024
Posts: 40
Likes: 5
One of my heroes when I first got started R/C helicopters was a amazing 3D R/C helicopter pilot back in the 90's. He had a jacket with embroidering of a helicopter inverted with the caption on it "Fly Skids Up". Unfortunately he passed away. Rest In Peace peace Ray. Here's video of me flying my SAB Raw 420 a few years ago.
Old Pro Solo Guy
Joined: Dec 2017
Posts: 7,966
Likes: 4,322
From: Marlton NJ
The tremec will make so much difference you may not even need the 373s for a BB. For a SB yes, But you have so much more TQ. It'll run just fine with 323s. With a better cruise. Your choice.
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Melting Slicks
Joined: May 2021
Posts: 2,256
Likes: 1,298
From: Fleming Island, FL
That helicopter is powered with a LiPo battery. I use 3 head speed, 2400, 2900, and 3150 RPM's and I get 5 minutes on a pack. I would never Buzz a individual or a animal. These things aren't toys and can and have killed people.
Melting Slicks
Joined: May 2021
Posts: 2,256
Likes: 1,298
From: Fleming Island, FL
Melting Slicks
Joined: May 2021
Posts: 2,256
Likes: 1,298
From: Fleming Island, FL
Melting Slicks
Joined: May 2021
Posts: 2,256
Likes: 1,298
From: Fleming Island, FL
Drifting
Joined: Oct 2005
Posts: 1,527
Likes: 148
From: East London/SW Essex UK
If we were on this forum perhaps 30 or 40 years ago we'd never be talking about 5 and 6 speed tranmissions, yes maybe overdrive units (and perhaps Hone-O-Drive?) - most modern daily drivers with 5 and 6 speed manuals and auto's with 8 and 10 speeds 'boxes plus computer controlled engines that perhaps spoil us allowing ultra low engine rpms on cruise.
Last edited by roscobbc; Jan 28, 2026 at 11:25 AM.
Drifting
Joined: Oct 2005
Posts: 1,527
Likes: 148
From: East London/SW Essex UK
When stock my '68 L36 with M21 and 3.08 would 'squeeze' about 12/13 imperial mpg (not US) in either urban or cross country driving. Current Brodix oval port headed stroker engine with mild cam and large double pumper with its 40% extra hp/tq more than stock will pull 15/16 imperial mpg on a 2500 rpm 70 mph cruise and perhaps 12/14 mpg in town. It would take so many years to justify the cost of a 5.6 speed transmisson.