5 speed gearbox on a series 3 Land Rover with a 2.25 stock petrol engine? - Defender Source
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  #1  
Old November 19th, 2011, 08:29 PM
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gabriel ochoa
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5 speed gearbox on a series 3 Land Rover with a 2.25 stock petrol engine?

Hello I want to improve the performance on my series Land Rover and would like to change the gearbox from the standard to a r380 or something like it.....

I have looked into overdrive options but still have that idea that a 5 speed would be even better.

I would appreciate any thoughts on this matter.

Thanks a lot,

Gabriel
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  #2  
Old November 19th, 2011, 08:37 PM
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Quote:
Originally Posted by gabrielochoa
Hello I want to improve the performance on my series Land Rover and would like to change the gearbox from the standard to a r380 or something like it.....

I have looked into overdrive options but still have that idea that a 5 speed would be even better.

I would appreciate any thoughts on this matter.

Thanks a lot,

Gabriel
An overdrive would give you 8 forward speeds and a heck of a lot easier to instal! I have a series and wouldn't even consider a 5 speed behind a 2.25.
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  #3  
Old November 19th, 2011, 11:40 PM
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An overdrive is a very easy install and RDS sells them at a good price. Probably the way to go.

Having said this, if you are willing to do a bit of work on the 2.25 gas motor a LT 77 will work and fit really nice. It is a super upgrade for a series motor IMHO

My last series motor was 2.25 built 30 over with a 2.5 cam. 2 barrel Weber with a Pierce manifold and 2 1/2" headers. It was a real blast and nice daily driver. Chris Laws at Badger Coachworks actually runs this combo.

A lot more work than a simple OD install but well worth the effort.

Best of luck
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  #4  
Old November 20th, 2011, 02:17 AM
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If you want to hook an LT77 to a series t-case Ashcroft makes the kit to do it:

http://www.ashcroft-transmissions.co...loads/lr77.jpg

http://www.ashcroft-transmissions.co...d&productId=83
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  #5  
Old November 20th, 2011, 10:15 AM
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How is your engine? I'd think you'd want more power than the stock engine if you really want to make use of 5th gear. As I recall most 5 speed conversions I've seen also had the engine swapped for something more powerful or a new turner engine installed.

Other considerations to think about might include the length of propshafts possibly changing and the e-brake linkage. I would assume the r380 and lt77 are both longer than the stock series gearbox.

When I added an overdrive to my series it was a wonderful improvement. I used it almost exclusively for the freeway, but there were a few times cruising off road where it was nice too.

Daniel
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Old November 20th, 2011, 11:05 AM
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Tom Rowe
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The R380 1st is a lower ratio than the Series III 1st, 3.321:1 vs 3.68:1, so in that respect performance will decline, IMO.
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  #7  
Old November 20th, 2011, 11:38 AM
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Andrew, totally forget about the Ashcroft setup. I have driven that and it is really sweet.

As for the length of the LT 77 . It has a short bell housing and is a direct bolt in to the 2.25 and 2.5 gas an 2.5 NA 2.5 turbo diesel.

The R380 has a longer longer bell housing because LR moved the 300 Tdi forward in the engine bay. You can fit a shorter bell housing to a R380. Ashcroft has the parts and sell this kit as well.

If you have an old tired motor this is probably not the best route. I would suggest a rebuild before going down this road. 30 or 40 over pistons and a 2.5 cam make it a really nice driver. The down side is I never got more than 18 mpg highway and usually 15mpg around town. Usually less, as I have a heavy foot I had to install an extra tank to have any kind of range.
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