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  #1  
Old August 8th, 2016, 09:20 AM
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Ashcroft options?

I'm thinking of ordering a Stumpy R380 and a 1.2 lt77 from Ashcroft to replace my lt77 and 1.4.
My question is that which of the options are worth getting.
On the tranny:
they offer 44l or 50j ( I think the 44l is right for the 200tdi)
Heavy duty rear support bearing?
And the higher 5th gear.


On the T/C:
Sleeved casing?

And heavy duty cross pin?

Atb center diff?
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  #2  
Old August 8th, 2016, 09:57 AM
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I would speak with Dave and ask his opinion based on current powertrain and expectations after swap.
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Old August 8th, 2016, 10:04 AM
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You need to carefully consider the gearing options. What LT77 do you have currently? There are a variety of possibilities and gear ratios. If you have a 0.83 5th and go to 0.77 and 1.2, you are 20% lower in 5th.

What engine? Stock? Souped up? How heavy are you on the off roading?
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Old August 8th, 2016, 10:19 AM
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Higher 5th and 1.2 sounds miserable on a 200tdi.

I would stick with 1.4 t-case and just replace the trans (and the t-case input gear).
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Old August 8th, 2016, 10:24 AM
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I got the higher 5th gear on mine when I replaced it and it dropped the rpms by ~ 400 driving 110-120 kph on the highway would definitely recommend it. That is in a fairly heavy 110 with the 300 tdi.

Brian
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Old August 8th, 2016, 10:26 AM
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I had 200 tdi, stumpy r380 with HD bearing and higher 5th with 1.4. Get the cross drilled input gear for your 1.4 if its not already . Loved it! The r380 has a different t/c linkage than the lt77. So you can ask to have a used set included as well. Dave was great and shipping took about 3 weeks but that was when they had to build to order. Ask if they have some built in stock, it will be a quicker turn.




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Old August 8th, 2016, 10:41 AM
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You don't want the 1.2 LT230.
Suggest you go with 1.4 gearing.
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Old August 8th, 2016, 11:23 AM
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The ratio calculator on their site is quite helpful, I have run tons of different scenarios weighing my options.


Anyway, it's on the bottom of the menu if you have not found it yet.
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Old August 8th, 2016, 01:57 PM
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Quote:
Originally Posted by BullTrout14 View Post
I got the higher 5th gear on mine when I replaced it and it dropped the rpms by ~ 400 driving 110-120 kph on the highway would definitely recommend it. That is in a fairly heavy 110 with the 300 tdi.

Brian
Is that with a 1.4 T/C?

------ Follow up post added August 8th, 2016 03:02 PM ------

I've got the later LT77, with a 1.4
110 crew cab, not overly heavy other than a cage and a winch bumper.
Updated intercooler stock location, but thinker. Fuel turned up a bit, nothing to crazy.
I'm really looking for more on the highway, to cruise at 65 with a little lower revs.
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  #10  
Old August 8th, 2016, 02:08 PM
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Yes, sorry forgot to specify.
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  #11  
Old August 8th, 2016, 02:27 PM
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Quote:
Originally Posted by tomaco1 View Post
I've got the later LT77, with a 1.4
110 crew cab, not overly heavy other than a cage and a winch bumper.
Updated intercooler stock location, but thinker. Fuel turned up a bit, nothing to crazy.
I'm really looking for more on the highway, to cruise at 65 with a little lower revs.
Need the serial number to figure out what you have. Most likely a 0.83 5th gear, though, so the R380 will already be 8% higher at 0.77.

For a 110, you will probably not be happy with 1st gear and the 1.2.

The 1.4 with the extra high 5th (0.73) might be the best choice. You still get stock first, with a 14% higher 5th.
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Old August 8th, 2016, 02:44 PM
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Great thanks.
I'm more than a bit clueless with the ratio thing, but is there a way to equate the 8% and the 14% to figure the drop in Rpms in 5th.
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Old August 8th, 2016, 03:08 PM
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Quote:
Originally Posted by tomaco1 View Post
Great thanks.
I'm more than a bit clueless with the ratio thing, but is there a way to equate the 8% and the 14% to figure the drop in Rpms in 5th.
You can play here: Ashcroft Transmissions - Ratio Calculator

Assuming 32" tires and current 5th is 0.83:1, at 65 mph, 2833 rpm

0.77 and 1.4 = 2625 rpm ( 2833/2625 = 1.08 i.e. 8%)
0.73 and 1.4 = 2496 rpm (1.14, 14%)
0.77 and 1.2 = 2254 rpm (1.26, 26%).
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  #14  
Old August 8th, 2016, 03:24 PM
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Thanks for all that. It's perfect. I'm gonna go out and get my truck up to 65
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  #15  
Old August 8th, 2016, 06:58 PM
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66mph@2800 rpm
200tdi LT77 (higher gearing, I assume). LT230 1.4 255-85-16s
VDO I set with a electronic tach thingy. Reflective tape and "Lazer"
VDO SPEEDO checked with GPS.
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