Anyone know Isuzu BG-5F ratios?

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Originally Posted by Bush65

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... Going by Isuzu boxes I know of, the 1st part of the model number (BG) is the box design, the '5' is number of forward gears, and the suffix (F) is a variant (other variants most likely have different ratios.

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The BG in this case would refer to the engine group "BG", I know my 6BB1 has a BB-5? which is direct in 5th.

There are a number of Isuzu O/D 5 speed but AFAIK they also lack the good crawler 1st which is great for an off-road truck like the F1 and Mk3/Mk4 Inters and the reason that a 6 speed O/D or 7 speed (double) O/D box would ideal for the project.

Diana

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Originally Posted by Lotz-A-Landies

The BG in this case would refer to the engine group "BG", I know my 6BB1 has a BB-5? which is direct in 5th.

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Not sure where you get that idea from?

Have a look at this list of engine and box combos:
New Zealand
There is no correlation between engine designation and box designation.

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Originally Posted by isuzurover

Not sure where you get that idea from?

Have a look at this list of engine and box combos:
New Zealand
There is no correlation between engine designation and box designation.

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Ben

You're probably right, I made it up!

• Ref: Model Eng G/box
• F501 83 JCR500 6BD1 ALI BD5C
• E448 FTR123 6BG1 BG5C
• 86 FTR123 6BG1 BG-5C
• C402 JC420 6BD1 BD-5C
• C398 FTR123 6BG1 BG-5C
• C377 FTR123 6BG1 BG5-F
• C364 FRR12FA 6BG1 BG-6U

and no one ever swaps over a gearbox because a second hand one was cheaper than repairing the OEM one.

Diana :)

Quote:

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Originally Posted by Lotz-A-Landies

Ben

You're probably right, I made it up!

• F501 83 JCR500 6BD1 ALI BD5C
• E448 FTR123 6BG1 BG5C
• 86 FTR123 6BG1 BG-5C
• C402 JC420 6BD1 BD-5C
• C398 FTR123 6BG1 BG-5C
• C377 FTR123 6BG1 BG5-F
• C364 FRR12FA 6BG1 BG-6U[

Diana :)

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So 7 that correspond to each other out of a list of ~200+

Why isn't Sprint's 6BD1 fitted with a BD box???

With logic like that you should join JohnF's bible numerology group.

Quote:

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Originally Posted by isuzurover

So 7 that correspond to each other out of a list of ~200+

Why isn't Sprint's 6BD1 fitted with a BD box???

With logic like that you should join JohnF's bible numerology group.

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Well actually the list was less than 150.

Of the 50 X 6 cylinder engine trucks listed:

• 9 do not list a gearbox at all. (50-9=41)
• 3 list only a number of gears not the G/B model. (41-3=38)
• all 3 6BB1 engines have BD-5C boxes. (38-3=35)
• 2 are ZF automatics. (35-2=33)
• 7 are Road Ranger transmissions. (35-7=26)

Which gives me a correlation of 27%

None of the 21 turbo motors follow the pattern but a significant number of the (22) NA engines (7/22) do (the turbo engines are frequently the ones with the autos or Road Ranger boxes).

Why Sprint's? Likely because it was a turbo engine and fitted with the later model box, just like the 6BB1 in the list, were fitted with the later BD-5C boxes where mine has an earlier BB-5? box