International Harvester 43 / 45

Manual transmission fluid capacity & service interval

International Harvester 43 / 45 manual transmission fluid capacity ranges from 35 to 42 liters. Service intervals include checks at 200 hours and fluid changes at 800 or 1600 hours. The data covers 7 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
845 XL, XLA (1983-1985)
  • Use: Normal
  • Capacity 42 liter
  • Check 200 hours
  • Change 1600 hours
  • Code: 16/8
743 (1981-1985)
  • Use: Normal
  • Capacity 35 liter
  • Check 200 hours
  • Change 800 hours
  • Code: 12/4
743 (1981-1985)
  • Use: Normal
  • Capacity 42 liter
  • Check 200 hours
  • Change 1600 hours
  • Code: 8/4
743 XL (1981-1985)
  • Use: Normal
  • Capacity 42 liter
  • Check 200 hours
  • Change 1600 hours
  • Code: 8/4
745 S (1981-1985)
  • Use: Normal
  • Capacity 35 liter
  • Check 200 hours
  • Change 800 hours
  • Code: 12/4
745 S (1981-1985)
  • Use: Normal
  • Capacity 42 liter
  • Check 200 hours
  • Change 1600 hours
  • Code: 8/4
745 XL (1981-1985)
  • Use: Normal
  • Capacity 42 liter
  • Check 200 hours
  • Change 1600 hours
  • Code: 8/4

Additional Notes

  • The International Harvester 43 / 45 series manual transaxle specifications list two distinct capacity values across the model range: 3.5 liters and 4.2 liters, both recorded under normal use conditions.
  • The 743 trim carries both capacity figures, with the 3.5-liter fill paired with an 800-hour change interval and the 4.2-liter fill paired with a 1600-hour change interval.
  • A 4.2-liter transaxle capacity on the 743 corresponds to a fluid change interval twice as long as the 3.5-liter configuration, at 1600 hours versus 800 hours under normal use.
  • The 743 XL is specified exclusively at 4.2 liters with a 1600-hour change interval, without a lower-capacity variant listed for the 1981-1985 period.
  • The 745 S shares the same dual-capacity pattern as the 743, with a 3.5-liter fill at an 800-hour change interval and a 4.2-liter fill at a 1600-hour change interval, both under normal use.
  • The 745 XL, like the 743 XL, is listed only at 4.2 liters with a 1600-hour change interval across the 1981-1985 range.
  • The 845 XL and XLA, introduced in 1983, carry the same 4.2-liter capacity and 1600-hour change interval as the XL variants in the broader series.
  • Across all seven specification rows, the fluid level check interval is uniformly set at 200 hours under normal use, regardless of capacity or change interval.
  • The 800-hour change interval associated with the 3.5-liter capacity appears only on the 743 and 745 S, while every XL and XLA variant in the specifications is aligned with the longer 1600-hour interval.

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